The Skin Age Question
Skin age is becoming a measurable biological concept
A new 2026 study in Frontiers in Aging proposes a way of treating skin around the eyes as more than a collection of visible signs. Using photographs and clinical information from 2,515 participants, researchers developed a measure of “periorbital skin age” and found that it was associated not only with skin ageing but with several aspects of participants’ medical history. Read the study
The idea is part of a broader shift in ageing research: away from treating age as a simple number and towards measuring biological changes that may vary between people and across different stages of life.
A recent Nature Reviews Genetics Perspective argues that human ageing is not adequately described as a steady, linear decline. Instead, ageing appears to involve periods of biological transition, where different systems can change at different rates. Read the Nature Reviews Genetics Perspective
That makes the phrase “skin age” rather more interesting.
If ageing isn't one simple clock, perhaps skin doesn't have one either.
Why it matters for aesthetics
The future model could become:
measure biological skin state → identify what is changing → treat → measure again → personalise the next intervention.
That is considerably more interesting than simply saying someone has “fine lines”.
But there is an important distinction.
A skin-age score is not automatically a measure of whole-body biological age. A photograph can capture visible features associated with ageing, and increasingly sophisticated models can turn those features into numerical estimates. But that doesn't mean the number represents the biological age of every tissue in the body.
The more interesting question is what, exactly, the number is measuring.
What if chronological age is becoming the least interesting way to think about ageing?
We tend to think of skin age as something written on the surface; in lines, texture, pigmentation and changes in elasticity.
But what we see is only part of the story.
Two people can be exactly the same chronological age and have very different skin. Their collagen, pigmentation, photoageing, barrier function and underlying biology can all be moving along different trajectories.
So perhaps the more interesting question isn't simply how old this skin looks.
It's what is actually happening underneath it.
Beyond the birthday
Chronological age is straightforward; it is simply how many years we've been alive.
Biological age is more complicated. Researchers use a range of measurements to understand how an individual's biology is ageing relative to their chronological age.
There isn't one universally accepted biological-age test.
Researchers are looking at DNA methylation, proteins, metabolites, physiological measures and, increasingly, machine-learning models.
Skin is particularly interesting because it sits at the intersection of intrinsic ageing and environmental exposure. Sunlight, inflammation and time all leave their marks.
And increasingly, researchers are finding ways to measure some of them.
Can we actually measure skin age?
In 2024, researchers developed VisAgeX, a skin-specific epigenetic clock using DNA methylation patterns from more than 370 female volunteers.
The researchers weren't simply trying to predict someone's chronological age. They were interested in features of visible skin ageing, including wrinkle grade, visual facial age and age progression.
The model was then tested against independent datasets, with the full methodology available in the original study.
That distinction is important.
A number saying you're 42 isn't particularly interesting if you're 42.
A biological measurement that helps explain why two 42-year-olds can have very different skin is much more interesting.
And now it gets less invasive
One of the developments I find particularly fascinating is skin tape stripping.
It sounds almost too simple. A small adhesive strip is applied to the skin and removed, collecting material from the outer layers of the epidermis. That material can then be analysed for molecular information.
A 2023 study found that tape-stripped skin could produce genome-wide DNA methylation profiles with strong concordance to conventional biopsy samples, while also revealing methylation changes associated with age and UV exposure. Original study
Then came another step.
A more recent study developed two skin-specific epigenetic clocks, MitraSolo and MitraCluster, using methylation data from 462 human epidermal samples. The models were validated against independent and longitudinal datasets, with an age-prediction error of approximately four years. Original study
This doesn't mean we now have a perfect “skin age” test.
It means we're getting better at measuring the biology behind what we see.
Evidence: 🟡 Skin-age biomarkers are an emerging area of research. Some measures are being investigated as indicators of biological ageing and health, but consumer “skin age” scores should not yet be treated as validated measures of whole-body biological age.
But what happens next?
Perhaps skin age isn't really one number.
A wrinkle score measures one thing. A facial-age algorithm measures something else. DNA methylation measures something else again.
So when someone tells you:
“Your skin age is 37.”
The interesting question might be: According to what?
And then comes the part I find even more interesting.
What if we could measure what's happening beneath the surface?
L'Oréal is already moving in that direction.
Its Cell BioPrint system uses a small tape-strip sample from the skin and analyses protein biomarkers to produce a biological skin-age assessment in about five minutes.
Image: L'Oréal Research & Innovation.
It is designed to look beyond what can be seen on the surface, including how skin is ageing and how it may respond to particular ingredients. Cell BioPrint
It's a fascinating shift; from looking at skin to measuring it, and then trying to understand what is happening beneath the surface.
But measuring ageing is only one side of the question.
What if we could actually build a model of ageing skin?
That's where I'm going next.
Next in Cesence
What happens when we stop measuring ageing skin and start trying to build it?
C·🌷
Research notes
Skin-specific epigenetic clock
Bienkowska et al., 2024
Development of an epigenetic clock to predict visual age progression of human skin.
Read the full study
Non-invasive skin methylome profiling
Banila et al., 2023
A noninvasive method for whole-genome skin methylome profiling.
Read the full study
Non-invasive skin biological-age assessment
Menendez Vazquez et al., 2025/2026
Epigenetic age predictors for non-invasive assessment of human skin.
Read the full study
Machine learning and skin-age estimation
McMullen et al., 2025
Machine learning methods for determining skin age: A systematic review.
Read the full review
Cell BioPrint
L'Oréal Research & Innovation
Cell BioPrint: The Future of Personalized Skin Care.
Research overview
Human skin bio-engineering
L'Oréal Research & Innovation
Human Skin Bio-Engineering.
Research overview