When Gray Hair Starts and What Counts as Premature

Most people see their first gray hairs in their 30s or 40s. The exact timing depends on ancestry, sex and family history. Reviews report that white people begin to gray in their mid-30s on average, Asian people in their late 30s and people of African descent in their mid-40s.

The usual starting age

The American Academy of Dermatology (AAD) says that, on average, hair starts to gray in the 30s or 40s. Cleveland Clinic gives the same range. MedlinePlus Genetics, run by the U.S. National Library of Medicine, adds that almost everyone's hair turns gray with age, but when it happens and how far it goes varies from person to person.

A 2005 review in the Journal of Investigative Dermatology describes the usual start as the late 30s. It also notes that the age of onset appears to be hereditary, which means it tends to run in families. Our main guide on why hair turns gray explains what happens inside the follicle at that point.

How ancestry changes the timing

Ancestry is one of the clearest influences on when graying begins. A 2013 review in the Indian Journal of Dermatology, Venereology and Leprology reports that white people begin to gray in their mid-30s, Asian people in their late 30s and people of African descent, the latest, in their mid-40s. The same review cites a study that found an average starting age of 34 for white people and 43.9 for Black people, with large differences between individuals.

A 2021 review of 69 publications in the Journal of Clinical and Aesthetic Dermatology reached the same order: mid-30s, late 30s, then mid-40s. A 2012 worldwide survey also found that people of Asian and African descent had less gray hair than white people of the same age.

Group, as named in the reviews	Average start of graying	Usually called premature if it starts before
White	Mid-30s	Age 20
Asian	Late 30s	Age 25
African descent	Mid-40s	Age 30

These group labels and cutoffs come from older medical studies, and they describe averages, not rules. A 2018 review in the International Journal of Trichology points out that a clear definition of premature graying for Asian populations is still lacking.

Men and women

The 2012 survey found that men had significantly more gray hair than women. The pattern also tends to differ. According to the 2013 review, graying in men usually begins at the temples and sideburns. It then spreads to the crown and the rest of the scalp, and the back of the head is usually last. In women, graying usually starts around the edge of the hairline.

The 50-50-50 saying, tested

For many years, people repeated a simple saying: by age 50, half of all people have half gray hair. The 2021 review describes this as the traditional view.

A 2012 study in the British Journal of Dermatology put it to the test. Trained experts compared the natural hair of 4,192 healthy men and women from several parts of the world with standard color samples. Between the ages of 45 and 65, 74 percent had some gray hair. On average, the gray covered 27 percent of the head.

The key finding was about age 50. Only 6 to 23 percent of people had at least half gray hair at that age, depending on their ethnic or geographic origin and their natural hair color. That is far below the 50 percent the saying suggests. The survey also found that both the age of onset and the speed of graying were clearly linked to origin.

What counts as premature graying

Doctors call graying premature when it starts much earlier than usual. The 2013 review uses these cutoffs: before age 20 in white people, before 25 in Asian people and before 30 in people of African descent. Cleveland Clinic uses a simpler version based on skin tone: before 20 for people with light skin and before 30 for people with dark skin.

Early graying is not rare. In a questionnaire study of 6,390 men under 30, published in the Journal of the American Academy of Dermatology, 25.3 percent reported premature graying. The study did not include women, and the authors noted that answers based on memory can be biased. Our post on gray hair in your 20s looks at the reasons in more detail.

Why some people start earlier

Family history is one of the clearest signals. Cleveland Clinic cites a study of people with premature graying in which nearly 40 percent had a family history of it. In the study of 6,390 young men, a family history of early graying was the factor most strongly tied to going gray early. Our page on genetics and gray hair explains what is known about the genes involved.

Other factors are linked to an earlier start:

• Smoking. In a survey of 207 adults in Jordan, smokers were two and a half times more likely to go gray before 30.
• Low vitamin B12 or iron. Cleveland Clinic says lower levels of both are linked to premature graying.
• Stress. Studies in mice and a small study of human hairs connect stress to graying, as explained in stress and gray hair.

Age still matters most. A 2020 study of nearly 1,000 people in Poland found that most of the ability to predict graying came from age alone. Genetic variants explained less than 10 percent of the differences between people.

How fast graying spreads

Graying rarely happens all at once. Each follicle has its own supply of pigment cells, and the 2005 review estimated that a scalp follicle goes through about 7 to 15 rounds of pigment cell renewal before gray appears. A physician writing for UAMS Health, the health system of the University of Arkansas for Medical Sciences, explains that the hairs around a gray hair do not turn white until their own pigment cells die.

This is why most people go gray slowly, a few hairs at a time. Even between 45 and 65, the gray in the 2012 survey covered 27 percent of the head on average. Our page on how hair gets its color explains the pigment cycle behind this. For the difference between single white hairs and a head of hair that looks gray, see white hair vs gray hair.

When the timing is a reason to see a doctor

Graying that follows the usual pattern for your age and family is expected. Some patterns are worth checking with a doctor or dermatologist:

• Gray or white hair that appears suddenly.
• A single patch of white hair. DermNet, a dermatology resource, defines this as poliosis, a sign rather than a diagnosis, with causes that include vitiligo and alopecia areata.
• Graying that starts well before the usual ages, especially with other new symptoms.

The AAD notes that a dermatologist can help if an underlying condition, such as a vitamin deficiency, may be affecting hair color. This page is general information, not medical advice.

We are developing LIUMIQ, a gradual color product for gray hair. It is not available to buy. To follow our progress, join the waitlist.