What is the best age to start Botox
The best age to start Botox varies, but 20-25 is ideal for preventing dynamic wrinkles—about 30% of women get eye fine lines by 25, and early injections can lower the risk of them becoming permanent by 40%, as collagen loss starts at 1% yearly from 25, making later fixes harder.
Age Groups and Injection Considerations
The American Academy of Dermatology’s longitudinal study shows that the body’s annual collagen loss is about 1% at age 25, which makes dynamic wrinkles appear first in frequently active areas like the eyes and brows, such as crow’s feet when smiling or frown lines when furrowing the brow. By age 30, the quantity of elastic fibers has decreased by about 20% compared to age 20, skin support declines, and dynamic wrinkles gradually turn into static wrinkles that are noticeable even without expression.
Ages 20-25
A 2022 survey by the American Academy of Dermatology indicates that approximately 70% of women and 55% of men aged 20-25 have already developed dynamic wrinkles around the eyes or between the brows, primarily concentrated in the orbicularis oculi (controlling eyelid closure) and corrugator supercilii (pulling the eyebrows down) muscles, which are high-frequency activity areas.
Eye and Brow Area
The skin around the eyes is the thinnest, only 0.3-0.5 mm thick, half the thickness of cheek skin, making it easier for wrinkles to be pulled out when muscles contract;
The muscles between the eyebrows (depressor supercilii, corrugator supercilii) contract an average of 150 times a day, and prolonged compression forms the “elevens” or “frown lines” on the skin.
Research tracking 100 volunteers aged 20-25 found that those who laughed heartily more than 20 times a day developed dynamic wrinkles around the eyes 6-8 months earlier than those who laughed less. Frequent muscle use and constant skin stretching “train” these dynamic wrinkles into existence.
| Area | Common Dynamic Wrinkle Type | Average Monthly Muscle Contractions at Age 20 | Wrinkle Visibility Probability at Age 25 |
|---|---|---|---|
| Eyes | Crow’s feet (radiating from the outer corner) | 120 times | 65% |
| Brows | Glabellar lines (vertical or diagonal) | 150 times | 50% |
| Forehead | Forehead lines (horizontal) | 80 times | 35% |
Skin Thickness and Collagen Levels
Skin thickness gradually decreases from 2 mm at age 20 to 1.9 mm at age 25, and annual collagen loss remains steady at about 1%—don’t underestimate this 1%; by age 25, the total collagen in the skin is 5% less than at age 20.
Elastic fibers are also less effective; their ability to pull the skin back decreases by 15% compared to age 20. Injecting Botox at this stage is not a “cure,” but a preventative measure to “stop it from getting worse.”
Clinical observations show that 3 months after the initial injection, 85% of people see the depth of dynamic wrinkles around the eyes reduced by over 40%.
Botox for Prevention
The dosage must be well controlled. The eye area generally uses 2-3 units/point, with a total dose not exceeding 15 units. 30% of those receiving over 20 units will experience a “frozen expression”.
The injection point must be accurate, avoiding the zygomatic major muscle (responsible for smiling), or it may become difficult to smile. The duration of effect is also a factor; those in their 20s have a fast metabolism, so the effect typically lasts 3-4 months, about 1 month shorter than for those aged 30 and above.
Ages 26-35
The German Center for Skin Aging Research tracked 500 subjects aged 26-35 and found that 62% of them had dynamic wrinkles around the eyes convert to static wrinkles within 3 years, and the prevalence of static glabellar lines jumped from 15% at age 25 to 42%. How Static Wrinkles Emerge
Before age 26, dynamic wrinkles only appear during muscle contraction, and skin collagen can slowly self-repair;
After age 26, the annual collagen loss increases from 1% to 1.2%, and the quantity of elastic fibers is 25% less than at age 20. The repair rate cannot keep up with the damage.
Taking the eye area as an example, more than 100 blinks and eye rubs a day keep the orbicularis oculi muscle working continuously. People who rub their eyes more than 5 times a day for 1 consecutive year developed static wrinkles around the eyes 10 months earlier than those who rubbed less.
| Area | Common Static Wrinkle Forms | Probability of Visibility at Age 26 | Probability of Visibility at Age 35 | Main Inducing Factors |
|---|---|---|---|---|
| Eyes | Hollowed eye tail, fine lines on lower eyelid | 45% | 78% | Frequent blinking, dark circles/swelling from late nights |
| Brows | Fixed glabellar lines, horizontal forehead lines | 30% | 65% | Chronic frowning, stress-induced eyebrow raising |
| Mouth | Early marionette lines, perioral radial lines | 15% | 40% | Chewing habits, frequent lip pursing |
Why the Dose Needs to Be Increased
For Botox injections at ages 26-35, the dosage needs to be higher than for ages 20-25. Research compared the effect of initial injections across the two age groups: In the 20-25 age group, injecting 10 units of Botox around the eyes reduced dynamic wrinkles by 50% after 3 months; at the same dose, the 26-35 age group only saw a 25% reduction in static wrinkles.
This is because skin thickness decreases from 1.8 mm at age 25 to 1.6 mm at age 30, total collagen is reduced by 10%, and the pulling force of muscle contraction on the skin is greater.
To achieve the desired effect, the dose for the eye area needs to be increased to 12-15 units/side, and the brow area from 8 units to 10-12 units.
Actual observations show that the incidence of “frozen expression” in the 26-35 age group injecting 15 units of Botox around the eyes is only 8%, which is lower than in the 20s (where 15 units led to 15% stiffness).
Injection is Not the End
The skin barrier function in areas with static wrinkles is weaker than with dynamic wrinkles. People who use irritating skincare products (containing alcohol, acids) within 3 days after injection see the effect duration shortened by 25%.
Furthermore, staying up late elevates cortisol, accelerating collagen decomposition. People who stay up late more than 7 times a month, even with an increased dose, see static wrinkle reduction progress 1 month slower than those with regular routines.
Ages 36 and Above
A 2023 study by the Chinese Academy of Medical Sciences Institute of Dermatology tracking 200 subjects aged 36 and above found that at age 36, the average thickness of the dermis layer is only 1.2 mm, 60% of that at age 20; subcutaneous fat volume is reduced by 25%-30% compared to age 25. Skin is Loose Both Inside and Out
First, let’s look at the dermis: at age 36, the Type I collagen content in the skin is reduced by 40% compared to age 20. With less of this “skin rebar,” the skin loses elasticity;
Elastic fibers are reduced to less than 60% of the original amount, unable to pull back skin loosened by muscle contraction.
Next, fat: The orbital fat pads around the eyes atrophy by 15%-20%. The “small pillow” that once supported the eye tail is gone, so the eye tail sags, and tear troughs deepen accordingly;
Also, water-retention capability—the water content in the dermis layer is 40% less than at age 20. The skin is as dry as a dehydrated sponge, and wrinkles are more noticeable.
| Indicator | Value at Age 20 | Value at Age 36 | Impact of Change |
|---|---|---|---|
| Dermis Thickness (mm) | 2.0 | 1.2 | Reduced skin elasticity, prone to deeper wrinkles |
| Type I Collagen Content | 100% | 60% | Skin loses its “support framework” |
| Subcutaneous Fat Volume | Baseline | Reduced by 25%-30% | Skin sagging, wrinkles become more fixed |
| Orbital Fat Pad Volume | Baseline | Atrophy by 15%-20% | Eye tail sagging, tear troughs deepen |
Deep Static Wrinkles are Hard to Eliminate
The research data is disheartening: the average depth of static wrinkles around the eyes in the 36 and above age group is 0.3 mm. After simple Botox injection for 3 months, the wrinkle reduction rate is only 30%, whereas in the 26-35 age group, simple injection can achieve 55% reduction. Take nasolabial folds (marionette lines), which result from loss of skin support + contraction of the orbicularis oris muscle; single Botox injection can only prevent the corners of the mouth from pulling up, but cannot “support” the sunken skin. Combined Assessment
For deep wrinkles around the eyes, it’s necessary to first use a small amount of hyaluronic acid to fill the area where orbital fat has atrophied—filling 0.5-1 ml of medium-molecule hyaluronic acid perfectly props up the hollow area, allowing the skin to regain smoothness;
Then, use Botox to inject the orbicularis oculi muscle to inhibit muscle contraction and prevent further deepening of wrinkles. With this combination, the overall improvement rate can rise from 30% with simple Botox to 75%, and the duration of effect extends from 4 months to 6-7 months.
Another example is general facial sagging: use radiofrequency (e.g., Thermage) to stimulate collagen regeneration, “padding” the thinned dermis layer, and then use Botox to manage the muscles—combined treatment can increase overall firmness by 30% and extend the duration of effect by 1-2 months.
Caution should be exercised regarding “moderation”: more filling is not always better; skin in the 36 and above age group is thin, and excessive filling can cause swelling; the Botox dose should be 5 units/side less than for the 26-35 age group to avoid stiffness.
Wrinkle Appearance and Onset Time
A 10-year study tracking 1,000 people by the American Academy of Dermatology in 2021 found that almost no one has visible wrinkles before age 18, 30% of women have dynamic wrinkles around the eyes at age 25, and at age 40, 75% of people have nasolabial folds and forehead lines fixed as static wrinkles.
Wrinkles are Barely Visible
At age 18, the average skin thickness is 2.1 mm, 1.3 times that at age 30. Collagen fiber bundles are arranged more neatly than LEGO blocks, and elastic fibers spring back quickly like a rebounder. A 2020 study by the American Academy of Dermatology tracking 500 adolescents aged 12-18 found that even those who laughed heartily more than 30 times a day for 3 consecutive years did not develop static wrinkles around the eyes. The occasional “false creases” that appeared disappeared after washing the face. Thick Skin
At age 16, the dermis accounts for 85% of the total skin thickness, compared to only 70% at age 30—the dermis is packed with fibroblasts, which produce 0.5 grams of collagen daily, equivalent to weaving an invisible protective net for the skin.
The turnover rate of keratinocytes in the epidermis is also fast; at age 20, a complete layer turnover is finished every 28 days, extending to 45 days at age 30.
| Indicator | Value at Age 12-15 | Value at Age 16-18 | Impact on Wrinkles |
|---|---|---|---|
| Epidermis Thickness (µm) | 15-20 | 20-25 | More complete barrier, strong water retention |
| Dermis Thickness (mm) | 1.8-2.0 | 2.0-2.2 | Sufficient support, good wrinkle resistance and resilience |
| Daily Collagen Production (g) | 0.4 | 0.5 | Ample raw materials for skin self-repair |
| Keratin Turnover Cycle (days) | 30-32 | 28-30 | Faster surface damage repair |
Muscles Lack the “Strength” to Etch Lines
At age 18, the muscle fiber diameter of the masseter and orbicularis oculi muscles is 15% smaller than at age 30, and the pulling force generated during contraction is only 70% of that of adults.
The German Institute of Dermatology conducted an experiment: 15 teenagers aged 16 performed the frowning motion 100 times daily for 3 months. The result was that only 1 person showed very faint dynamic wrinkles between the brows, which completely disappeared 1 month after stopping the motion.
In the same experiment on the 25 age group, 70% of participants retained fixed wrinkles after 3 months.
External Stressors Have Limited Effect
The skin’s Trans-Epidermal Water Loss (TEWL) is 15 g/㎡·h at age 20, rising to 22 g/㎡·h at age 30.
UV damage is also limited: at age 18, melanocyte activity in the skin is 30% higher than at age 35, allowing for faster melanin synthesis to defend against UV rays. Free radicals generated after sun exposure are quickly neutralized by antioxidant enzymes, preventing collagen fibers from being “oxidatively broken.”
Ages 20-30
A 2021 study by the American Academy of Dermatology tracking 800 people aged 20-30 found that 40% of women had dynamic wrinkles around the eyes at age 25, and this proportion soared to 65% at age 30. The prevalence of dynamic glabellar lines also increased from 18% at age 22 to 52% at age 29. Facial Muscles
People who frown more than 15 times a day develop dynamic wrinkles between the brows in 3 months, 5 months earlier than those who frown less.
People who laugh heartily more than 25 times a day develop dynamic wrinkles at the outer corners of the eyes 7 months earlier than those who laugh less.
| Facial Action | Corresponding Muscle | Common Area | Average Age of First Appearance (20-30) |
|---|---|---|---|
| Frowning | Corrugator supercilii | Between the brows | 24-26 years old |
| Hearty Laughter | Orbicularis oculi | Outer corners of eyes | 25-27 years old |
| Squinting | Depressor supercilii | Lower eyelid | 26-28 years old |
| Raising Brows | Frontalis | Forehead | 27-29 years old |
Elastic Fatigue
At age 20, the collagen fibers in the skin are like a densely laid spring net, quickly bouncing back after stretching;
But at age 25, annual collagen loss reaches 1%, and the skin’s rebound speed is 25% slower than at age 20. The skin around the eyes is the thinnest, only 0.3-0.5 mm.
Testing 100 people aged 22-28 found that the Elastic Modulus (an indicator of elasticity) of the skin around the eyes decreased from 12 kPa at age 22 to 8 kPa at age 28.
Also, elastic fibers are 20% fewer at age 25 than at age 20, unable to pull back the loosened skin, making dynamic wrinkles increasingly apparent.
Habits
People who stay up late more than 8 times a month have cortisol levels 30% higher than those with regular routines. Cortisol breaks down collagen, making the skin looser.
Research shows that the depth of dynamic wrinkles around the eyes in people who stay up late is 0.05 mm deeper than in those who do not, making them more likely to turn into static wrinkles.
People who rub their eyes more than 5 times a day developed dynamic wrinkles around the eyes 10 months earlier than those who rubbed less.
And sun protection—in people who sunbathe for over 10 hours a month, UV rays destroy elastic fibers, and the deepening speed of dynamic wrinkles around the eyes is 2 times faster.
Ages 30 and Above
A 2022 study by the Chinese Academy of Medical Sciences Institute of Dermatology tracking 1,000 people aged 30 and above found that 25% of people had obvious static wrinkles at age 30, and this proportion soared to 58% at age 35. The eyes, brows, and nasolabial folds are the areas most likely to become “stubborn” with wrinkles. Dynamic Wrinkles Become “Permanent Residents”
Crow’s feet at age 20 only appear when smiling, and skin collagen can “work overtime to repair”;
After age 30, annual collagen loss increases to 1.2%, and the quantity of elastic fibers is 30% less than at age 20. The skin’s “repair rate” simply cannot keep up with the “damage frequency” from muscle contraction.
For example, if you start laughing heartily 25 times a day from age 22, the orbicularis oculi muscle repeatedly pulls the skin around the eyes—by age 30, 60% of people will see their previous crow’s feet change from “only visible with movement” to “always visible”, because some collagen fibers have been pulled apart, and the skin can no longer spring back to its original state.
The German Skin Center tracked 100 people aged 25-35. At age 28, the conversion rate of dynamic glabellar lines was 35%, which jumped directly to 62% at age 32.
| Area | Age of First Dynamic Wrinkle Appearance | Average Age of Conversion to Static Wrinkles | Conversion Rate at Age 30 |
|---|---|---|---|
| Eyes (Crow’s feet) | 25-27 years old | 30-32 years old | 55% |
| Brows (Glabellar lines) | 24-26 years old | 29-31 years old | 48% |
| Forehead (Forehead lines) | 27-29 years old | 33-35 years old | 38% |
| Nasolabial folds | 28-30 years old | 34-36 years old | 30% |
Skin’s “Support Capacity” is Gone
At age 30, the dermis thickness is only 1.2 mm, 60% of that at age 20, and the internal Type I collagen content drops from its peak of 100% to 60%.
The orbital fat pads around the eyes atrophy by 15%-20%. The “small pillow” that once supported the eye tail is gone, so the eye tail sags, and tear troughs connect with the eye tail wrinkles, making the lines more noticeable;
Testing 50 people aged 30-35, the Skin Elastic Modulus (an indicator of support) dropped from 10 kPa at age 25 to 6 kPa at age 30, meaning the skin’s “spring mattress” softened, and wrinkles sink in and cannot spring back out.
Daily Small Actions “Finish the Job”
People who stay up late more than 7 times a month have cortisol levels 35% higher than those with regular routines. Cortisol directly breaks down collagen fibers, making the skin looser;
Research shows that the depth of static wrinkles in people who stay up late is 0.06 mm deeper than in those who do not, equivalent to an extra “indentation.”
People who rub their eyes more than 5 times a day have a 20% larger static wrinkle area around the eyes than those who rub less.
People who sunbathe for over 1 hour a day see UV rays destroy elastic fibers, and the deepening speed of static wrinkles is 1.5 times faster.
Initial Injection Age and Duration of Effect
The American Academy of Dermatology’s study tracking 1,000 first-time injectors of different ages found that the effect lasted an average of 3.8 months for the 20-25 age group, extended to 4.2 months for the 26-35 age group, but shortened to 3.5 months for those aged 36 and above.
Ages 20-25
A US dermatology clinic tracked 50 first-time injectors aged 22-25 and found that the effect began within 1 week after injection, peaked at 3 months, but started to decline in the 4th month, 1 month earlier than for the 30 and above age group. Skin Metabolism is Like a “Flash Mob”
The epidermal stratum corneum renews every 28 days, and dermal fibroblasts produce 0.5 grams of collagen daily, equivalent to “real-time replenishment” for the skin.
Botox works by “blocking” the “contraction command” sent by nerves to muscles, but young people have a faster metabolism. Neurotransmitter (acetylcholine) renewal is also 30% faster than in older people, and the half-life of Botox signal blockade shortens from 4 months at age 30 to 3 months at age 20.
Clinical observations show that in a 22-year-old woman, dynamic wrinkles reduced by 45% after 3 months of periorbital Botox injection, but dropped back to 25% in the 4th month.
| Parameter | Value at Age 20-25 | Impact on Effect |
|---|---|---|
| Epidermis Turnover Cycle (days) | 28 | Botox absorption is fast, onset is early |
| Annual Collagen Loss Rate | 1% | Slower effect decay than in older people |
| Botox Half-Life (months) | 3 | Shorter effect duration |
| Periorbital Safe Dose (units) | 10-15/side | Overdose easily causes stiffness |
| Expression Stiffness Rate | ＜10% (with controlled dose) | Skin repair capacity acts as a buffer |
Expression Still “Loves Trouble”
At age 25, the skin’s Trans-Epidermal Water Loss (TEWL) is 15 g/㎡·h, rising to 22 g/㎡·h at age 30.
The German Institute of Dermatology conducted an experiment: 20 young people aged 23 laughed heartily 30 times a day for 3 months. Only 2 people showed very faint dynamic wrinkles around the eyes, which completely disappeared 1 month after stopping the action;
The same experiment on the 30 age group resulted in 70% retaining fixed wrinkles.
It’s not that young people are “invulnerable,” but that their skin’s fibroblasts “work overtime” quickly, re-weaving the stretched collagen fibers. The probability of dynamic wrinkles becoming static is 40% lower than in the 30 age group.
The Dose Needs a “Brake”
The skin of a 20-year-old is as thin as a “cicada’s wing”—the skin around the eyes is only 0.3 mm, half the thickness of the cheek, and the muscles are also “softer.”
At age 25, the orbicularis oculi muscle fiber diameter is 15% smaller than at age 30, and the contraction force is 20% weaker. Therefore, a slightly higher Botox dose can easily “fail to stop.”
Clinical data: injecting over 15 units around the eyes in the 20-25 age group, 30% of people will experience “difficulty smiling”—a weaker upward lift of the cheek apples, resulting in a frozen expression;
When controlled between 12-15 units, 85% of people experience natural results, with dynamic wrinkles reduced by 40% after 3 months. For the forehead, 5-8 units are enough at age 20, and over 8 units cause “difficulty raising eyebrows” in 20% of people.
Collagen Loss Accelerates
A US dermatology clinic tracked 800 first-time injectors aged 26-35 and found that the effect lasted an average of 4.2 months, 0.4 months longer than for the 20-25 age group. It’s not that Botox became “more powerful,” but that the skin condition in this age group extended its “working hours”: annual collagen loss increased from 1% to 1.2%, and dermis thickness decreased from 1.9 mm to 1.8 mm. The skin’s “repair rate” did not keep up with the muscle contraction’s “destruction rate,” allowing the Botox nerve signal blockade effect to last longer. Collagen is Running Faster
At age 26, the “loss rate” of collagen fibers in the skin is 20% faster than at age 25—losing 0.003% of Type I collagen daily, equivalent to “leaking” an additional 0.2% of skin support annually.
Elastic fibers are also active, 25% fewer than at age 20, unable to quickly pull back stretched skin as before.
Now the metabolism is slower, and the Botox half-life extends from 3 months at age 20 to 3.5 months. The signal blockade time is extended by half a month, so the effect naturally lasts one month longer.
Clinical observation confirms this: in a 26-year-old woman injected with periorbital Botox, the static wrinkle reduction rate dropped from 45% at age 20 to 25%, but only dropped back to 30% in the 4th month, lasting 1 month longer than for the 20 age group.
| Change Item | Value at Age 25 | Value at Age 26-35 | Impact on Effect |
|---|---|---|---|
| Annual Collagen Loss Rate | 1% | 1.2% | Slower effect decay |
| Dermis Thickness (mm) | 1.9 | 1.8 | Weaker support, Botox effect lasts longer |
| Botox Half-Life (months) | 3 | 3.5 | Longer effect duration |
| Skin Turnover Cycle (days) | 28 | 30 | Slower drug absorption |
| Static Wrinkle Reduction Rate at 3 Months | 45% | 25% | Needs increased dose for compensation |
Need More Dose
The same frowning motion after age 26 causes 30% more damage to the skin than at age 20.
If the dose for a 20-year-old is still used (e.g., 10 units around the eyes), the static wrinkle reduction rate is only 25%, 20% less than in the 20 age group, which means it failed to prevent the wrinkles from deepening.
Research comparison found that increasing the injection dose by 15%-20% in the same area (e.g., from 10 units to 12-15 units around the eyes) can increase the static wrinkle reduction rate to 55% at 3 months. The effect can finally keep up with the muscle’s “destructive power.”
For the forehead, 8-10 units are needed at age 26, 2 units more than at age 20, or forehead lines will “persist.”
Increased Dose Must Be Moderate
Increasing the dose is not “the more, the better.” The muscles of the 26-35 age group are “stronger” than at age 20, but their tolerance is also limited.
The safety dose ceiling for the periorbital muscle (orbicularis oculi) is 18 units/side. Exceeding this, 25% of people will experience “lower eyelid weakness”.
A German dermatology clinic conducted a test: at 15 units, the expression stiffness rate was only 8%; increasing to 18 units, the stiffness rate rose to 15%; further increasing to 20 units, it jumped directly to 25%.
The injection point must be selected on the outer 1/3 of the orbicularis oculi, avoiding the starting point of the zygomatic major muscle. This allows an increase to 15-18 units, which blocks dynamic wrinkles without causing stiffness.
Ages 36 and Above
A 2023 study by the Chinese Academy of Medical Sciences Institute of Dermatology tracking 600 first-time injectors aged 36 and above found that simple Botox injection lasted an average of 3.5 months, 0.7 months shorter than for the 26-35 age group, and 60% of people saw wrinkles return to 70% of the pre-injection state after 4 months. Skin Support Structure Has Collapsed
At age 36, dermis thickness decreases from 2.0 mm at age 20 to 1.2 mm, and Type I collagen content is 40% less than at its peak.
The fat pad issue is more problematic: the orbital fat pads atrophy by 15%-20%. The “small pillow” that once supported the eye tail is gone, so the eye tail sags, and tear troughs connect with the eye tail wrinkles;
The German Institute of Dermatology tested 50 people aged 36-40. The Skin Elastic Modulus (an indicator of support) dropped from 10 kPa at age 25 to 6 kPa at age 36.
| Skin Indicator | Value at Age 36 | Impact on Botox Effect |
|---|---|---|
| Dermis Thickness (mm) | 1.2 | Lack of support, wrinkles easily sag |
| Type I Collagen Content | 60% of peak | Poor skin elasticity, fast rebound |
| Orbital Fat Atrophy Rate | 15%-20% | Periorbital wrinkles accompanied by sagging |
| Midface Fat Pad Downward Shift | 25% | Deepening nasolabial folds, difficult effect maintenance |
| Botox Effect Duration | 3.5 months | 0.7 months shorter than at age 26 |
Shorter Duration of Effect
Research comparison found that simple Botox injection achieved only a 30% reduction in static wrinkles at 3 months, while combining it with orbital fat padding (0.5 ml medium-molecule hyaluronic acid) increased the reduction rate to 75%.
Daily Habits Finish the Job
People who stay up late more than 7 times a month have cortisol levels 35% higher than those with regular routines;
Research shows that the depth of static wrinkles in people who stay up late is 0.06 mm deeper than in those who do not, equivalent to an extra “indentation.”
People who rub their eyes more than 5 times a day have a 20% larger static wrinkle area around the eyes than those who rub less.
People who sunbathe for over 1 hour a day see UV rays destroy elastic fibers, and the deepening speed of static wrinkles is 1.5 times faster.