Key takeaways
- Wrinkles are caused by a combination of internal and external factors: collagen and elastin breaking down in the dermis, repeated muscle movement folding the skin in the same places over years, UV exposure accelerating that breakdown, and lifestyle factors like smoking and poor sleep speeding the process up.
- The skin’s structural decline begins earlier than most people realise, with collagen production slowing from the mid-20s and dropping sharply for women in the first years after menopause, which is why wrinkle changes can seem to accelerate at certain stages of life.
- Because wrinkles form for different reasons, two lines that look the same on the surface can have different underlying causes, which is what determines how each one is approached.
You don’t usually notice wrinkles forming.
It’s more that one day, something looks different. A line catches the light. Your makeup sits slightly unevenly. And you start wondering if it’s new — or if it’s been there longer than you realised.
Because that’s the thing. Wrinkles rarely appear all at once.
They build slowly because of a mix of changes happening under the surface, plus everything your skin’s been exposed to over time.
Age is part of it. But it’s not the full story.
How wrinkles form: the role of collagen and elastin
Wrinkles form in the dermis, the thick middle layer of skin beneath the surface. Three things in that layer determine whether skin stays smooth or starts to crease.
Collagen is the main structural protein, making up 70-90% of the dermis by dry weight, and it gives skin its firmness and strength. Elastin accounts for only 2-4%, but it does the work its name suggests: it lets skin stretch and then snap back into place. Hyaluronic acid holds water throughout the tissue, keeping it hydrated and plump.
When all three are working well, skin that folds when you move settles flat and the fold disappears. As collagen and elastin break down and the dermis holds less water, the skin stops springing back and the fold stays behind as a visible line.
This is also why wrinkles aren’t all the same. Some only show up when you move your face and vanish when it’s at rest. Others stay visible even when your face is still. These two types, known as dynamic and static wrinkles, account for most of the lines that develop across the face.
Dynamic wrinkles become static wrinkles over time
Dynamic wrinkles come from muscle movement. When you frown, squint, or raise your eyebrows, the muscles pull the skin into a fold, and the line appears for as long as the expression holds. In younger skin it disappears the moment the face relaxes.
Static wrinkles are visible at rest. The line stays because the skin has lost enough recoil that the fold no longer releases on its own.
Both are stages of the same process. A spot that creases thousands of times every year eventually stops bouncing back, turning lines that once only appeared during movement into lines that stay put. This is why some lines look fine at 30, not so much at 50. At 30 it’s dynamic and gone when your face relaxes, at 50 the support is gone and the line stays even at rest.
Why does skin lose collagen as it ages?
Skin ageing is partly driven from within, independent of any external factors. The main reason is that the dermis gradually produces less collagen than it once did.
This starts earlier than people expect. Collagen production begins to slow from the mid-20s and continues declining each year. Fibroblasts, the dermal cells that produce collagen and elastin, decline with age. Skin from people over 80 has been found to contain around 35% fewer fibroblasts than skin from people in their twenties. Fewer fibroblasts means less new collagen, so the dermis loses structure faster than it can rebuild it.
For women, this decline sharpens at menopause. Oestrogen supports collagen production, and as levels fall, collagen is lost rapidly. Studies report women lose around 30% of their skin collagen in the first five years after menopause, followed by a steadier decline of about 2% per year. This is why skin changes can seem to accelerate in a relatively short window as we age.
Some lines have more than one cause
Marionette lines, or the lines from the corner of your mouth to the chin, are one example. Repeated pull from the muscles around your mouth, combined with fat pad descent and collagen loss, gradually sets those lines into place.
Nasolabial folds, or the lines running from your nose to the corners of your mouth, are another example. Mid-face volume loss and constant facial movement slowly push those folds deeper into the skin.
Bone resorption can magnify facial lines even further by reducing the structural support beneath the skin.
Sun exposure is the biggest external cause of wrinkles
More than any other outside factor, sun exposure drives how quickly skin wrinkles. Research attributes around 80% of visible facial ageing to UV exposure rather than the passage of time. It’s the single largest cause you can do something about.
The damage works through collagen. When UV reaches the skin, it triggers the release of enzymes that break collagen and elastin down faster than the skin rebuilds them. Repeated exposure keeps those enzymes elevated, so the breakdown outpaces repair year after year, and the loss of support shows up as lines and looser skin. This is a documented driver of wrinkle formation, not just a contributor to “ageing.”
Part of why sun does so much damage is how far it reaches. Some of the sun’s rays only affect the surface, but others travel deeper, down to the layer where collagen and elastin sit, which is exactly where wrinkles are driven from.
The clearest illustration is on your own body. Skin that’s rarely seen sun, like the skin on your bum, stays smoother and firmer well into older age than the face or hands, despite being exactly the same age. The difference is accumulated UV.
Lifestyle factors that speed wrinkles up
A few everyday habits influence how fast the skin’s structure breaks down. They don’t create wrinkles on their own, but they affect how quickly the skin loses collagen and how well it recovers.
Smoking works through the same enzyme process as sun exposure, raising the chemicals that break collagen down while slowing how much new collagen the skin produces. It loses ground from both directions at once. Sleep is when most of the skin’s repair happens. Consistently poor sleep leaves less time for that overnight recovery, so daily damage accumulates faster than the skin clears it.
Alcohol is a diuretic, which pulls water out of the skin and leaves it less plump. The liver produces damaging molecules as it breaks alcohol down,that wear collagen down over time. Air pollution introduces particulate matter from traffic, smoke, and industrial emissions which generate damaging molecules in the skin that wear down collagen over time.
Voluntary expressions like squinting at screens, in bright light, or when concentrating, repeated over and over throughout the year, gradually starts to form wrinkles Hydration and diet work at the margins. Well-hydrated skin looks smoother, though the effect is temporary and sits at the surface rather than reaching the collagen underneath. Nutrients give the skin the materials it uses to repair and rebuild its structure.
The main types of facial wrinkles and where they appear
Wrinkles get different names depending on where they sit on the face, and each spot has its own reason for creasing.
- Crow’s feet are the lines that fan out from the outer corners of the eyes. They come from the muscle that closes the eye, working every time you smile or squint.
- Under-eye lines sit just below, where the skin is the thinnest on the face and creases earliest. The eye area as a whole is the first place most people notice fine lines.
- Frown lines, the vertical creases between the eyebrows often called “the 11s,” come from the muscles that pull the brows inward when you concentrate or frown.
- Forehead lines are the horizontal ones above 11s, set by the muscle that raises the eyebrows. Both are movement lines on one of the most expressive parts of the face.
- Perioral lines are the fine vertical lines around the lips, sometimes called lip lines. They come from the constant movement of the mouth, talking, eating, pursing, on skin that’s relatively thin and gets little structural support.
Does dry skin cause wrinkles?
Dry skin does not cause wrinkles, but it does make them easier to see.
Wrinkles form deeper down, in the skin’s structure. Dryness sits on the surface, so it doesn’t create the line, it changes how the line looks. Dry skin is less plump and reflects light unevenly, which makes lines that are already there appear deeper and more obvious. Add water back and those same lines often soften, not because the wrinkle changed, but because the surface did.
That surface-level effect is also why dry skin and dehydrated skin aren’t the same thing.
When causes point toward treatment
Tracing a wrinkle back to its cause is crucial because the cause is what determines how it’s addressed. A line driven by muscle movement is a different starting point from one driven by collagen loss, sun damage, or changes in the fat and bone underneath. Two lines that look identical can call for completely different approaches depending on what’s behind them.
This is why no single treatment suits every wrinkle. What’s appropriate depends on which cause is at play, often more than one at once, which is what wrinkle treatments are matched to.
Professional standards at Luxe Lips
At Luxe Lips, a cosmetic clinic in Melbourne, our care is grounded in medical ethics and clinical responsibility. Every treatment pathway is approached as a medical process, with established health protocols and safety guiding each step.
Across our clinics in Moonee Ponds, Camberwell, and Brighton, our medical professionals carry out a thorough screening process for every person. For those exploring options around wrinkles, this includes reviewing medical history, assessing skin quality and the pattern of lines being considered, and considering psychological readiness. In line with local guidelines, this evaluation helps determine whether a proposed plan aligns with your health.
Medical professionals proceed only when a treatment is clinically appropriate. If the underlying cause of a wrinkle, the condition of the surrounding skin, or your broader health profile means a particular approach isn’t the right fit, we will explain why and discuss what that means for you. The focus is always on clear information and maintaining a clinical environment where safety and ethical standards come first.Because responses and circumstances vary, a consultation is required to determine suitability before wrinkle treatments are considered.
Note: Individual responses vary. A consultation with a qualified professional is required to determine the suitability of any treatment for your specific needs.
Frequently asked questions about wrinkles and their causes
Earlier than you’d think. Collagen production begins to slow in your 20s, and the dermis loses a small amount of structure every year after that. The visible lines often arrive later, but the process underneath is already underway.
What you see at 30, 40 or 50 reflects a mix of that slow internal decline and how much sun, movement and lifestyle exposure has stacked up alongside it. Two people the same age can display radically different levels of wrinkle formation,
To examine where your skin sits today and what’s driving the changes you’re noticing, a consultation with a medical professional is the appropriate starting point.
Changes in hydration, lighting, or skin quality can make them seem more noticeable from one day to the next.
Yes, and this is the most useful thing to understand about wrinkles. A line driven by repeated muscle movement is a different starting point from one driven by collagen loss, sun damage, or changes in the fat and bone underneath. On the surface they can look almost identical.
The cause is important because it’s what determines how a line is approached. Dynamic wrinkles, static wrinkles, and lines tied to volume loss each behave differently and call for different planning.
Identifying what’s behind a line is something a consultation with a medical professional can work through with you directly.
Partly. Genetics influence how much collagen and elastin your skin produces, how quickly that production slows with age, and how your skin responds to UV. This is why some people show lines earlier than others despite similar lifestyles.
What genetics don’t decide is the rest of it. Sun, smoking, sleep, repeated movement and the cumulative weight of daily habits still account for a substantial share of how skin ages, regardless of the genetic starting point.
To map out which factors are most relevant for your skin, a consultation with a medical professional is the right context.
It comes down to a few biological differences. Women’s skin is generally thinner than men’s, produces less oil, and goes through a much sharper hormonal change later in life. Men’s skin ages too, but the change is steadier.
The years around menopause are where the difference becomes most noticeable. Oestrogen supports collagen, and when levels drop, the skin loses structure faster. Lines that were forming quietly can become much more visible in a short window, which is why this stage often catches people off guard.
How your skin is responding to that change is something a medical professional can clarify in a consultation.
Fine lines are the earlier stage. They sit closer to the surface, often appear only with movement, and tend to soften when the skin is well hydrated. The structural loss underneath is still relatively early.
Wrinkles are deeper and more established. They reflect more advanced collagen and elastin breakdown in the dermis, and they often stay visible at rest rather than vanishing when your face relaxes. Both are part of the same process at different stages, but the way each is approached can differ.
To assess which category a particular line falls into, a consultation with a medical professional is the appropriate step.
They contribute. Every time you frown, squint or raise your eyebrows, the muscles pull the skin into a fold. In younger skin the line vanishes the moment the expression ends. Over years of repetition, the same spots gradually stop bouncing back, and what was once a dynamic line becomes a static one.
This is why movement lines tend to appear in predictable places: between the brows, across the forehead, around the eyes. The expression itself isn’t the problem. The cumulative repetition on skin that’s also losing collagen is what sets the line.
What’s worth discussing in a consultation with a medical professional is how that pattern is showing up for you.
ceable depending on these factors.
For most people, yes, and it’s bigger than the holiday and beach exposure people tend to picture. The damage that does the most work is incidental. Driving with sun on your face, walking between meetings, sitting near a window, the daily exposure that adds up year after year without anyone tracking it.
This is why sun damage often surfaces later than expected. The damage from years of unremarkable, everyday exposure can take a long time to become visible, and by then it appears as ageing rather than as the cause it actually is.
What that accumulated exposure looks like for your skin is something a medical professional can examine in a consultation.
Not in the way most people hope. Wrinkles form in the dermis, where collagen and elastin sit. Drinking water doesn’t reach that layer to be able to rebuild structure, so it doesn’t undo a line that’s already set.
What hydration does affect is how the surface looks. Well-hydrated skin is plumper and reflects light more evenly, which can make existing lines appear softer. The line itself hasn’t changed. The surface has.
This is part of why dry skin and wrinkled skin are often confused. To walk through what’s structural and what’s surface-level for your skin, a consultation with a medical professional is where that gets sorted.
A few patterns come up often. The years around menopause are one, because the drop in oestrogen accelerates collagen loss in a relatively short window. Cumulative sun is another, since damage from years earlier often becomes visible long after the exposure itself.
Recent changes can also play a role. Significant weight loss, a prolonged stretch of poor sleep, a period of elevated stress, or a change in skincare routine can all affect how lines appear at the surface, even when the underlying structure hasn’t changed much.
What’s behind the change for you specifically is something a medical professional can determine in a consultation.
part of the broader picture, alongside daily habits like sun protection and skin care consistency.
No. Wrinkles are a structural change in the dermis, not an indicator of skin health. Skin that’s healthy, well-cared-for and functioning normally still develops lines over time, because collagen production slows with age regardless of how well the skin is looked after.
What wrinkles can sometimes reflect is cumulative exposure: years of UV, smoking, or repeated movement showing through. That’s a record of what the skin has been through, not a judgement on its current condition. Healthy skin and lined skin are not opposites.
To establish what your lines are telling you about your skin specifically, a consultation with a medical professional is where that conversation happens.
