8years old

Collagen 100 of 100

58,400 smiles

One man, two ages.

In a study of 29 cars, side windows blocked just 71% of UVA on average.³⁰

Sculpted for this page, not a photo of him. See the real case.

Photograph of a 69-year-old man facing the camera. The left side of his face is far more wrinkled and thickened than the right. — This is him.
Photo: Gordon JR, Brieva JC, 2012, New England Journal of Medicine. © 2012 Massachusetts Medical Society.²⁸

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One day, the line stays.

Follow a wrinkle

The story of one line, from age 8 to 80. By Eva AI.

Try to wrinkle this skin.

Hold the button, then let go. It snaps flat. At 80, the same fold stays. So what changes?

Look under the line.

This is the skin beside your eye, on a microscope slide. The pink and violet are lab dyes, not skin color. The surface renews itself every four to six weeks¹², so the answer isn’t up there. It’s deeper.

Collagen is the rope.

Those wavy pink bundles are about three-quarters of your skin’s dry weight³. Like rope, they’re strong and barely stretch.

Elastin is the spring.

The fine violet threads are just 2 to 4% of the dermis⁴, and they’re why the fold vanished. Hold the button: the coils pull straight. Let go: they snap back.

Doctors really test this. Pull the lower lid gently from the eye and it should spring back at once⁵.

Collagen holds. Elastin returns.

That’s the whole system. A wrinkle is what’s left when they wear out. The rest of this story is about what wears them out.

Start the clock at 20.

Call your collagen 100. A classic study of 148 people found it falls about 1% a year through adult life⁶⁷. You won’t see it for years.

Every smile pulls the same spot.

The muscle around your eye is a ring, attached to the skin around the socket⁸. That skin is under a millimeter thick⁹. Wrinkles form at right angles to the pull¹⁰, which is why crow’s feet fan outward.

Say you smile 20 times a day.

Nobody has counted yours, but the arithmetic is the point. By 35, that’s about 255,500 folds in the same few millimeters.

Your ageUsed only on this page.

For now, it still comes back.

Doctors call this a dynamic line: it arrives with the expression and leaves with it¹¹. Try it. A little slower than at eight.

Smoke shows up. Sugar might.

In 79 pairs of identical twins, a five-year difference in smoking showed in the face²⁰. Sugars slowly bond to collagen, shown here in amber, and skin collagen lasts for years, so they build up²²²³. But no trial has shown that eating less sugar reduces wrinkles.

Menopause matters. Check the number.

You may have heard women lose 30% of their collagen in five years. That figure appears in reviews²⁴, and we couldn’t find a primary study behind it. Biopsy studies measured about 1 to 2% a year²⁵. Real, but not a cliff.

The frame shrinks under the fabric.

Fat sits in separate compartments that change at different rates, and parts of the facial skeleton recede²⁶²⁷. Skin that fit at 30 now has slack in it.

This is what time alone does.

62 years. Thinner, looser, less collagen. But look how orderly it still is. We left something out.

Now add the sun.

Every day outside, for 62 years. UVB burns, and the surface absorbs almost all of it. UVA is 90 to 95% of the UV that reaches you, and it goes on into the dermis¹³. Up to 80% of UV gets through cloud, and UVA can pass through ordinary window glass¹⁴.

Sunlight cuts collagen.

Within hours, even at doses too low to redden you, skin starts making enzymes that break collagen down¹⁵. In one experiment, UV-exposed skin broke down 58% more¹⁶. The theory: repair is imperfect, so each round leaves a flaw. Decades of them add up to a scar too fine to see.

Sunlight knots elastin.

Sun-damaged elastin piles up as tangled, blue-grey clumps. It’s called solar elastosis, and it appears in sun-aged skin, not in skin that has simply got older¹⁷¹⁸.

Melanin is a head start.

Those brown specks absorb UV before it goes deeper. Darker skin tends to show wrinkles later, often by a decade or more, though it’s more prone to uneven pigmentation¹⁹. It isn’t immunity.

One man, two ages.

A 69-year-old had driven a delivery truck for more than 25 years. The left side of his face, beside the window, showed far more sun damage than the right²⁸²⁹. In a study of 29 cars, side windows blocked just 71% of UVA on average³⁰.

How much of aging is sun?

A L’Oréal-led study of 298 French women scored it at about 80% of visible facial aging signs³¹. That’s one group, not a law of nature. In 186 pairs of identical twins, the one with more sun or smoking tended to look older²¹.

Now do it all at once.

Same line. Same smile. Hold the button and don’t let go.

That’s a wrinkle.

The muscle has let go and the fold is still there. Doctors call it a static line¹¹¹². Nothing happened on any particular day. It’s every smile you ever had, and the skin finally keeping one.

Now go back to 35.

Some of that was time, and nobody gets out of time. Much of it wasn’t. The rest of this line hasn’t been drawn yet.

Everything sold for wrinkles does one of five things.

If a product can’t tell you which one, that tells you something.

Shield the collagen
Plump the surface
Fill the fold
Rebuild the collagen
Stop the fold

Shield the collagen.

Strong evidence: a large randomized trial

903 Australian adults under 55 were assigned daily sunscreen, or to use it when they chose. Over four and a half years the daily group showed no detectable increase in skin aging, measured from skin texture, and aged about 24% less³².

The trial used SPF 15 or higher³³. Dermatologists now advise broad-spectrum SPF 30 or higher, a shot glass for exposed skin, every two hours outdoors³⁴.

Rebuild the collagen, with a cream.

Strong evidence: randomized trials, for tretinoin

Prescription tretinoin has the best evidence of any cream for sun-aged skin. In one trial, collagen formation rose 80% over 10 to 12 months and fell 14% on placebo³⁵³⁶. Retinol, over the counter, is milder, with smaller studies³⁷³⁸. Expect months, and some irritation. Don’t use retinoids during pregnancy.

Rebuild the collagen, with a laser.

Medical procedure, with recovery time

A fractional laser makes tiny columns of controlled injury and leaves healthy skin between them. Healing lays down new collagen for at least three months⁴⁵⁴⁶.

Stop the fold.

Medical procedure, lasts about 3 to 4 months

Botulinum toxin blocks the signal from nerve to muscle⁴¹. Hold the button: the skin hardly moves. It works on lines made by movement, not deep lines already there at rest¹¹, and it fades, sometimes after longer than 4 months⁴².

Fill the fold.

Medical procedure, typically lasts 4 to 12 months

A hyaluronic acid gel placed under a fold lifts it from below⁴³. Some last up to two years⁴⁴. It treats the shape of the line, not the cause. Who injects it matters.

Plump the surface.

Works, but only on the surface

Moisturizer helps the outer skin hold water, which softens the look of fine lines. It rebuilds nothing³⁹. Hyaluronic acid does help skin hold water, but the famous claim that it binds 1,000 times its weight has no direct experimental support⁴⁰.

And the rest?

Weak, mixed or no good evidence

Collagen supplements look good in pooled trials⁴⁷, until a 2025 analysis set aside low-quality and company-funded studies and the benefit disappeared⁴⁸. Extra water may slightly hydrate the surface, with no good evidence it changes wrinkles⁴⁹. Face yoga rests on one uncontrolled pilot of 16 women⁵⁰. Sleep lines are thought to come from pillow pressure, not expression⁵¹.

This is your line, so far.

About 255,500 smiles, and every one of them worth it. Protect the skin that carries them, and don’t let anyone sell you a reason to stop.

Your ageUsed only on this page.

The perfect wrinkle routine

Everything sold for wrinkles does one of five things.

Shield the collagen
Block the UV before it reaches the collagen.
Daily SPF 30+Shade and clothingNot smoking
Rebuild the collagen
Prompt the skin to make new collagen.
Tretinoin or retinolLaserVitamin C, peptides
Stop the fold
Relax the muscle, so the skin stops folding.
Botox
Fill the fold
Lift the crease from underneath.
Filler
Plump the surface
Hold water in the outer skin.
Moisturizer

Where the 100 points go

Preventing wrinkles, scored out of 100. Four boring habits earn 80.

Points are Eva AI’s judgment, not study results. Pick any box to see its evidence.

The foundation80 points

Optional extras20 points

Adds little or nothing

Broad-spectrum SPF 30+.

Daily use slowed skin aging in a randomized trial³²³⁴.

These points are Eva AI’s judgment, not study results. We make software for aesthetic practices, including some that offer these treatments.

How we scored this

They lean toward prevention, where the evidence on this page is strongest, and we weighed that against cost, risk and effort for a typical adult, rounded to the nearest 5. Treatments can still matter for lines you already have. Your skin, budget and clinician may say otherwise.

Questions about wrinkles

Short answers, from the story and its sources.

What causes wrinkles?

Skin rests on two proteins: collagen, which holds it, and elastin, which springs it back. Collagen falls about 1% a year through adult life⁶⁷, and every expression folds the same thin skin, so lines form at right angles to the muscle’s pull¹⁰. Sunlight speeds it up: it breaks collagen down¹⁵ and knots elastin¹⁷. Smoking shows in the face too²⁰, and the fat and bone underneath change with age²⁶²⁷.

What is the difference between dynamic and static wrinkles?

A dynamic line arrives with an expression and leaves with it. A static line stays when the face is at rest¹¹¹². Static lines usually start as dynamic ones: the same fold, repeated for years, in skin that no longer springs all the way back.

At what age do wrinkles start?

There’s no fixed age. Collagen falls about 1% a year through adult life⁶⁷, but it takes years to show, and the first lines come and go with expression¹¹. Sun and smoking bring them forward³¹²⁰. Darker skin tends to show wrinkles later, often by a decade or more¹⁹.

Does sunscreen prevent wrinkles?

It has the strongest evidence of anything sold for wrinkles. In a trial of 903 Australian adults under 55, the group assigned daily sunscreen showed no detectable increase in skin aging over four and a half years, and aged about 24% less than the group that used it when they chose³². The trial used SPF 15 or higher³³; dermatologists now advise broad-spectrum SPF 30 or higher, reapplied every two hours outdoors³⁴.

How much of skin aging is caused by the sun?

One L’Oréal-led study of 298 French women scored the sun at about 80% of visible facial aging signs³¹. That’s one group, not a rule. In 186 pairs of identical twins, the twin with more sun or smoking tended to look older²¹, and a man who drove a delivery truck for more than 25 years had far more sun damage on the window side of his face²⁸. Up to 80% of UV gets through cloud, and UVA passes through ordinary window glass¹⁴: in a study of 29 cars, side windows blocked just 71% of it on average³⁰.

Does retinol work on wrinkles?

Prescription tretinoin has the best evidence of any cream for sun-aged skin: in one trial, collagen formation rose 80% over 10 to 12 months and fell 14% on placebo³⁵³⁶. Over-the-counter retinol is milder, with smaller studies³⁷³⁸. Both take months and can irritate, and retinoids shouldn’t be used during pregnancy.

What is the difference between Botox and filler?

Botox (botulinum toxin) blocks the signal from nerve to muscle, so it softens lines made by movement, not deep lines already there at rest⁴¹¹¹. It usually lasts about 3 to 4 months, sometimes longer⁴². A hyaluronic acid filler is a gel placed under a fold to lift it from below⁴³. It typically lasts 4 to 12 months, some up to two years⁴⁴, and it treats the shape of a line, not its cause. Both are medical procedures, and a licensed provider should judge what suits your face.

Can wrinkles be reversed?

Partly. Tretinoin and fractional lasers help skin lay down new collagen³⁵⁴⁵⁴⁶. Botox and filler change how a line looks while they last. Moisturizer softens the look of fine lines but rebuilds nothing³⁹. Nobody gets the years back; daily sunscreen is what keeps more of them from adding up³².

Do collagen supplements, drinking water or face yoga reduce wrinkles?

Not on current evidence. Collagen supplements look good in pooled trials⁴⁷, but a 2025 analysis that set aside low-quality and company-funded studies found the benefit disappeared⁴⁸. Extra water may slightly hydrate the surface, with no good evidence it changes wrinkles⁴⁹. Face yoga rests on one uncontrolled pilot study of 16 women⁵⁰.

Sources

Checked October 30, 2026. The slide is a drawing, and the timings and ages in it are exaggerated so you can feel them; they are not measurements of anyone’s skin. This page is education, not a diagnosis or a treatment plan. No product here paid to be mentioned.