Collagen gets the headlines. But hormones, sun, facial fat, bone and your skin barrier are all in on this, and men and women don’t necessarily run on the same clock.
You know the moment.
You walk into a bathroom you’ve used for fifteen years, flip on the light, and the mirror says something you didn’t ask it to say. A woman notices it in the makeup that suddenly settles into places it never used to. A man notices it in a vacation photo. Wait, is that my jaw?
Nothing changed. Same routine, same face, same you. But somehow it looks like your skin aged overnight.
It didn’t.
Several slow changes have been stacking up underneath the surface, and for women, one of them can accelerate on a schedule most skincare ads politely skip. For men, the schedule is different and in some ways sneakier, because nothing ever announces it.
TWO CLOCKS
In one classic study of skin thickness, men’s skin thinned steadily starting around age 20, while women’s stayed relatively stable until about 50, then began to decline.
Not every study has found exactly the same timeline, so 50 isn’t some biological expiration date. But the broader point is worth remembering: male and female skin aren’t identical, and they don’t necessarily age in identical patterns.
Slow leak vs. steeper stretch
Men generally start with thicker skin, and skin collagen declines across adulthood in both sexes. But the difference isn’t simply how much changes. It’s also how those changes unfold.
For men, hormonal changes tend to be more gradual. Think of it as a slow leak, easy not to notice until a guy looks at himself at 48 and wonders when exactly that happened.
Women have another variable layered on top of ordinary chronological aging: menopause. As estrogen falls, collagen, skin thickness, hydration and elasticity can change more noticeably over a relatively short period.
So women may experience more of a steeper stretch around menopause, while men often get more of a slope.
It’s an imperfect shorthand for complicated biology, but it’s a useful one.
The number everyone quotes, and how loosely to hold it
If you’ve read anything about skin and menopause, you’ve seen this one: women may lose about 30% of their skin collagen during the first five years after menopause, followed by a slower decline afterward.
Thirty percent.
That gets your attention.
It also comes largely from older research and has been repeated so many times that it now sounds like a law of nature. It isn’t. Treat it as a useful estimate, not a prediction of exactly what will happen to your face.
Here’s the twist that makes the research more interesting. Some studies have found that collagen-related changes track strongly with estrogen deficiency and time since menopause, while visible wrinkling is also heavily influenced by chronological age, skin characteristics and accumulated sun exposure.
In other words, menopause doesn’t simply hand you 30% more wrinkles.
The change may be harder to put your finger on than that. Skin can become thinner, less elastic and less structurally supported. Sometimes what looks different isn’t simply the number of lines.
It’s that the skin holds itself differently.
Your face isn’t a painting. It’s a building.
Most skincare treats your face like a painting: the surface is the whole story. But skin is actually the top layer of a structure. Underneath it are superficial and deeper compartments of facial fat, muscles and connective tissue. Under all of that is the facial skeleton.
And all of it changes.
Facial fat doesn’t sit in one smooth layer like frosting. Researchers have mapped separate compartments throughout the face, and those compartments don’t all age at the same speed. Deep and superficial fat can change differently, altering the contours we associate with a younger or older face.
The bone isn’t fixed either. The facial skeleton continues remodeling throughout adulthood, including around the eye sockets, midface and jaw. As the structure underneath changes, so does the support for everything sitting on top of it.
That’s why two people the same age can age so differently. It’s also why a great cream can freshen the paint but can’t rebuild the walls.
That’s not an argument against skincare.
It’s an argument for knowing which layer you’re working on.
Skin keeps receipts
Every summer you spent outside without SPF went on a tab.
Ultraviolet exposure damages collagen and other structural components of skin over time, and the bill can eventually show up as wrinkles, uneven pigment, roughness and lost elasticity. A meaningful chunk of what we casually call aging is really accumulated sun exposure layered on top of biological aging.
The good news is that this is one area where doing something has actually been tested.
In the Nambour trial in Australia, 903 adults under 55 were randomized to daily broad-spectrum sunscreen use or to using sunscreen at their own discretion. After 4.5 years, the daily sunscreen group had 24% lower odds of skin aging progressing (relative odds 0.76), and researchers detected no increase in skin aging in that group over the study period.
It was measured on the backs of the hands rather than faces, and the trial had limitations, including some missing outcome data. Still, long randomized trials of sunscreen and visible aging are rare.
And the result is wonderfully unglamorous. Boring and consistent beats exciting and occasional.
Guys, this next part is for you.
In 2020 U.S. survey data, only 12.3% of men said they always used sunscreen when outside on a sunny day for more than an hour, compared with 29.0% of women.
The people who generally start with the thicker skin are the ones least likely to protect it.
THE SEPTEMBER TAKE
Women may hit a steeper hormonal stretch. Men tend to get more of a slope. But one of the biggest levers is the same for both of you, and one of you uses it a lot less.
You can’t schedule your hormones or freeze your facial structure at 35. You can decide, every morning, whether to protect the collagen you still have.
When “more” makes it worse
Skin also changes in the way it handles moisture and protects itself from the outside world.
This is where the science gets messier than the serum aisle would have you believe. Hydration, skin lipids, pH, cellular turnover and barrier recovery can all change with age, but they don’t change identically in every person. Sex, body site, environment and skin characteristics all matter.
What you actually notice may be much simpler: skin that tolerated almost anything at 30 suddenly gets dry or irritated by things you’ve used for years.
And when that happens, the instinct is often to throw more at it.
An acid. A retinoid. Another exfoliant. Something with a name that sounds vaguely pharmaceutical. Whatever TikTok said this morning.
Then you wonder why your face looks angrier.
Sometimes mature skin needs more support and less aggression. A gentle cleanser, a moisturizer and sunscreen aren’t terribly exciting, but neither are glycerin and petrolatum, and both have a long history of being useful for hydration and barrier support.
Your bathroom doesn’t have to look like a chemistry lab for your skin to be well cared for.
The unglamorous winners
Retinoids. These have something many trendy skincare ingredients don’t: decades of human research.
A 2025 meta-analysis pooled eight randomized trials involving 1,361 people and found that topical tretinoin improved both fine and coarse facial wrinkles from photodamage compared with vehicle treatment. Most participants in tretinoin trials have been women, so direct data in men is thinner, though there’s no obvious reason it would work differently. It can also irritate, which is worth remembering because peeling your face off isn’t the goal.
The useful retinoid is the one you can use appropriately and tolerate consistently.
Collagen supplements. This story is more interesting than either side of the internet tends to admit. Trials have reported improvements in skin hydration and elasticity, but they vary in quality and design, and researchers have called for larger, better studies. So “collagen supplements are useless” is too simplistic. So is “drink collagen and rebuild your face.” Collagen gets its own article soon.
Not smoking. Smoking has long been associated with premature facial wrinkling, but twin research gives us an unusually vivid way of seeing it. When researchers compared identical twins with different smoking histories, the twin with greater smoking exposure showed more pronounced facial aging in areas including the eyelids, cheeks and lips.
Same genes, similar beginnings, different exposure, and eventually a different face looking back.
Where peptides fit
This is one of the more interesting corners of skin research right now, because peptides aren’t one thing. They’re small chains of amino acids that can act as biological signals, and different peptides are being investigated for very different reasons.
Three names that come up repeatedly around skin are GHK-Cu, KPV and glutathione. They aren’t interchangeable, and the research behind each one tells a different story.
GHK-Cu is probably the most recognizable of the three in skincare. GHK is a naturally occurring tripeptide that binds copper, creating the copper-peptide complex GHK-Cu. Researchers have been interested in it for decades because of its involvement in processes connected with tissue remodeling, wound repair and the extracellular matrix, the structural neighborhood where collagen lives.
Cosmetic research and reviews have reported improvements in skin density, thickness, laxity and the appearance of fine lines with topical copper-peptide formulations. At the same time, the published human clinical literature is smaller than its popularity might suggest, and mostly made up of small, industry-funded studies. Researchers are still working through an important practical question: how effectively can a peptide cross the skin barrier and reach the place where you want it to act? Delivery is a big reason researchers are exploring approaches beyond creams, and it’s an area we’ll keep following.
That doesn’t make the story less interesting.
It actually makes it more interesting.
There’s substantial biological research behind GHK-Cu, some encouraging topical human data, and still plenty left to learn about formulation and delivery. That’s exactly the kind of middle ground that tends to disappear online, where everything has to be either a miracle or a scam.
KPV is an earlier-stage story worth watching. It’s a tiny three-amino-acid fragment associated with alpha-MSH, a signaling peptide involved in several biological processes. Researchers have studied KPV for anti-inflammatory activity in laboratory and animal models, and lab work has also shown antimicrobial activity against organisms including Staphylococcus aureus and Candida albicans.
Does that tell us what KPV ultimately means for skin?
Not yet.
But it does explain why researchers are interested in it. KPV is a good example of what peptide research often looks like before something becomes familiar: scientists identify an interesting biological signal, explore what it does in cells and models, and then start asking where that biology might eventually matter.
Glutathione comes at skin from another direction. It’s an antioxidant the body makes naturally from three amino acids, and much of the human skin research has centered on pigmentation rather than wrinkles.
A recent systematic review found several randomized trials of oral glutathione reporting reductions in melanin index compared with placebo, along with research on topical formulations. The studies are relatively small and results vary by formulation, which makes this an evolving area rather than a finished story.
And that’s really the useful way to think about all three.
GHK-Cu, KPV and glutathione are being studied for different biological reasons and sit at different places on the research timeline. We’re going to give them their own deeper dives rather than trying to squeeze the entire peptide conversation into a skin-aging article.
Because this is exactly where wellness gets interesting: not when we pretend every new idea is already proven, and not when we dismiss everything that hasn’t finished its research journey.
It’s when we understand why scientists are looking at it in the first place.
A word on hormones
Older studies found that estrogen therapy could influence skin collagen and thickness after menopause, which makes sense given how responsive skin is to hormonal signaling.
But hormone therapy is medical treatment with benefits and risks that extend far beyond appearance, and the same goes for testosterone therapy in men. Neither should be treated as a skincare strategy.
The useful takeaway here isn’t “take hormones for your skin.”
It’s much more interesting than that:
Your skin is hormone-responsive tissue.
What happens hormonally inside the body can eventually become visible on the outside.
What you can change
You can’t stop your facial bone from remodeling, freeze your fat compartments in place or undo the sun exposure you accumulated before anyone convinced you SPF mattered.
But that’s very different from saying you’re powerless.
You can stop adding quite so much to the UV tab. You can use ingredients that have real evidence behind them. You can support skin that’s becoming drier instead of attacking it with every active ingredient that goes viral. You can skip the cigarettes. And you can pay attention to emerging areas of research, including peptides, without needing every interesting idea to be either completely proven or completely dismissed.
Most importantly, you can stop interpreting every change in your face as evidence that you somehow failed to take care of yourself.
The mix that supported your face at 25 (hormones, collagen, fat distribution, bone structure and accumulated environmental exposure) isn’t identical to the one supporting it at 50.
At 65, it will be different again.
Some of that is modifiable. Some isn’t.
Knowing which is which makes skincare considerably more useful, and often considerably less expensive.
Do this week
1. Make sunscreen automatic. Broad-spectrum sunscreen on exposed skin, consistently. The randomized trial gives us solid evidence that this very boring habit matters.
2. If your skin is suddenly dry or reactive, simplify before you stack. Give it a break from the chemistry experiment. Gentle cleanser, moisturizer and sunscreen are a perfectly respectable reset.
3. Get more curious about claims. Whether it’s a retinoid, collagen powder, copper peptide or whatever ingredient owns your social feed next week, ask one question: What exactly has been studied?
You don’t need a PhD to become much harder to market nonsense to.
And that’s a useful skincare skill at any age.
This article is for education and isn’t medical advice. Talk with a qualified clinician about your own skin and health.
Sources & Further Reading
Hughes MC, Williams GM, Baker P, Green AC. Annals of Internal Medicine, 2013. Sunscreen and Prevention of Skin Aging: A Randomized Trial. The landmark Australian Nambour trial followed 903 adults for 4.5 years and found significantly less progression of skin aging among those assigned to daily sunscreen use.
Rahrovan S, Fanian F, Mehryan P, Humbert P, Firooz A. International Journal of Women’s Dermatology, 2018. Male versus female skin: What dermatologists and cosmeticians should know. A useful review of biological differences between male and female skin, including differences in thickness, collagen and how those characteristics change with age.
Stevenson S, Thornton J. Menopause International, 2007. Effect of estrogens on skin aging and the potential role of SERMs. A review of estrogen’s relationship with skin collagen, thickness, hydration and other characteristics, including the research behind the often-cited acceleration of collagen loss around menopause.
Pickart L, Margolina A. International Journal of Molecular Sciences, 2018. Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data. An overview of research into the naturally occurring copper peptide GHK-Cu, including its relationship with tissue remodeling, extracellular-matrix biology and earlier topical cosmetic research.
Sarkar R, et al. International Journal of Dermatology, 2024. Glutathione as a skin-lightening agent and in melasma: a systematic review. A recent review of human research involving glutathione and pigmentation, including randomized studies examining oral and topical formulations.