The short list
Perceived age is the age a stranger would give a face with the birthday hidden. A younger reading is ordinary, and so is an older one. Neither is a diagnosis.
The studies below point to six things, roughly in this order: inherited traits such as gray hair, hairline and lip height; sun and smoking, which show up mostly as wrinkles; facial fat, whose effect flips around 40; the contrast between brows, lips and skin; hair color and styling; and the photo itself, which can move a reading by years. Each section says who was studied, so you can judge how far it applies to you.
What is inherited, and how large it is
Gunn and colleagues, in PLoS ONE, 2009, graded 102 pairs of Danish female twins aged 59 to 81 and 162 British women aged 45 to 75. Wrinkles, gray hair, and lip height each predicted perceived age on their own. Perceived age, spots, wrinkles, and visible sun damage split about evenly between genes and environment. Gray hair, hairline, and lip height were mostly genetic. Thinning was mostly environmental. The sample is midlife and older women, not men and not people in their twenties.
About two years, not a decade
Liu and colleagues, in Current Biology, 2016, scanned 2,693 older Dutch adults in the Rotterdam Study. The hit was MC1R. Two risk copies looked 1.81 years older than none, and one copy 0.87 years older, after age, sex, and wrinkles. Skin color and sun damage did not explain it. It repeated in Leiden (599 people) and TwinsUK (1,173). In that set, women were rated 1.53 years above their age on average and men 1.49 years below. One older European cohort, not a rule for you.
Survival evidence starts at 70
Christensen and colleagues, in the BMJ, 2009, followed 1,826 Danish twins aged 70 and over for about seven years. An older look tracked earlier death after age, sex, and childhood home, and still after physical and cognitive scores. A wider pair gap meant the older-looking twin more often died first. Perceived age also tracked telomere length. A young read at 25 or 40 is not a survival score.
Sun and smoking mostly show up as wrinkles
In the Gunn models, sun-damage grades tracked perceived age until wrinkles were included. After that the sun grade added nothing, so listing both as equal causes counts one cue twice.
Guyuron and colleagues compared 186 identical-twin pairs in Plastic and Reconstructive Surgery, 2009. Longer smoking looked older. More sun, more outdoors, and no sunscreen looked older, and that gap grew with age. Hormone replacement was linked with a younger look. That is a prescribed treatment, and this page does not recommend it.
Facial fat flips direction with age
In those twins, a body mass index about four points higher looked older under 40 and younger after 40. About eight points looked older under 55 and younger after 55. Not a reason to gain weight. The Gunn composites also pointed at fat under the skin. Under 40, the heavier face was not the younger one.
Contrast, hair, and lips
Porcheron, Mauger, and Russell, in PLoS ONE, 2013, measured 289 French Caucasian women aged 20 to 69 in controlled light. Contrasts fell with age, led by eyebrow-to-skin lightness (correlation -0.50). Judges picked the higher-contrast edit as younger in 93 percent of trials. Rated alone, it looked about 1.1 to 1.3 years younger than the low-contrast edit, beside a separate report of about 3.6 years from erasing wrinkles, methods the authors called not comparable. They tested adult Caucasian women only and said they cannot claim the same for men, children, or other ages.
Overhead light flattens lip-to-skin contrast, so an evening photo can read older than a morning one. Coloring gray hair changes a cue. It does not change MC1R or wrinkles.
What reads older, and what reads younger
The same factors run the other way when a face reads older. Before blaming any of them, rule out the photo: one harsh, close or overhead-lit picture is the most common reason for a surprising number.
Reads older
Reported directions, not a personal score.
- Longer smoking, or more sun with no sunscreen. The sun gap grew with age.
- Under 40, a body mass index about four points higher than a twin.
- Lower brow, eye, and lip contrast, in the women Porcheron measured.
- A tight crop with hair and clothes removed.
Reads younger
The reverse. Nothing here is a product.
- Less sun and no smoking. After 40, higher body mass index looked younger. Not advice to gain weight.
- Higher contrast: about one year in the edited photos, not ten.
- Fuller lips, independent of wrinkles, in women 45 and older.
- No MC1R risk copy: under two years in the Rotterdam analysis.
Check the age this face reads
The tool above returns an age, a range, confidence, 3 to 5 cues, and 2 notes. Free, no account, 10 a day. The photo is analyzed in memory and never stored. See the privacy policy.
If you are worried you look older, do not trust a single selfie. Gunn's assessors rated cropped faces 4.16 years older for age than passport-style photos. The BMJ photos were passport-style shots at 0.6 meters. A close phone is a different input. Use the face age photo checklist and the overlap of two or three ranges.
When friends guess low, hair, facial volume, contrast and styling all play a part, and so does politeness. Same light: guess my age. Cue by cue: How Old Do I Look AI. Not a biological-age test, and not a health test.
Questions after you see the number
Why do I look younger than my age when I have not done anything special?
Genes and environment split perceived age about evenly in the twin work, and gray hair, lip height, and hairline were mostly inherited. No routine can be the whole answer.
Does a younger face mean a longer life?
The BMJ result is only for Danish twins aged 70 and over. It does not grade a younger adult.
Why did two photos of me disagree?
Crop, light, and distance change the file. Gunn's assessors found a 4.16-year gap between cropped faces and passport-style photos.
Is the photo stored, and is this medical advice?
The photo is analyzed in memory and never stored. The result is not medical advice, not a biological age, and not a check for allowing or refusing anyone anything.