Hair will generally be at its best in the early 20s, says Burg, because “hair shafts are thick and cuticles are tight.” Women may see changes if they are stressed, extreme dieting or using contraception.
(Another fun fact: While men experience their thickest hair in their 20s, many women experience their thickest head of hair in this decade.)
Your hair at this age: Sebum (oil) secretion tends to diminish in our 60s and 70s+, and this can make the hair dry and brittle.
The rate of hair growth also slows. Hair strands become smaller and have less pigment. So the thick, coarse hair of a young adult eventually becomes thin, fine, light-colored hair. Many hair follicles stop producing new hairs.
Your hair texture is constantly in flux, and the process starts a lot earlier than you may expect. “Hair aging is an ongoing, subtle process [that begins] from about the age of 16,” says Anabel Kingsley, brand president and consultant trichologist of Philip Kingsley.
It's a cliché for good reason, apparently – longer hair can be ageing as we get older. This is especially true if you're starting to see some grey strands, Neil Moodie, session stylish and Viviscal ambassador, tells us. It might be worth considering a cut, if this is you.
Just like a person's skin, hair goes through five specific signs of aging, says AGEbeautiful. They are: thinning hair, wiry gray hair, graying hair, dryness and dullness.
Rossi generally tells his patients they should wash their hair once or twice per week. But if you've had chemical treatments that can make your hair drier — such as bleach, perms or relaxers — you might want to wash it less than once weekly to avoid breaking or brittle hair or split ends, he said.
Typically, white people start going gray in their mid-30s, Asians in their late 30s, and Blacks in their mid-40s. Half of all people have a significant amount of gray hair by the time they turn 50.
People with longer hair often notice changes in hair density and thickness between their roots and their ends. Indeed, it is a common problem for people who have medium to long hair.
Everyone's scalp can get a little oily sometimes. But a little oil is OK! Oil (sebum) helps protect and support healthy hair. But an abnormally oily scalp can feel like a problem if it makes your hair feel greasy or dirty all the time.
Hair growth flourishes from a clean, healthy scalp. The bottom line is that dirty hair doesn't grow any faster than clean hair, so you may as well have a clean scalp and fresh tresses. Your strands will look better, feel better, and be healthier, too.
If you normally wash everyday, it'll take time to get used to washing it less. So start by going an extra day or two in between your normal washes. Rinse your hair with water in between shampoos and try to build up to once a week. When your hair adjusts you'll notice a dramatic difference.
Hair thickness is an “additive" trait. This means that if you inherited two copies of the “thick hair" version of the gene (one from each parent), you'll likely have even thicker hair strands than if you only inherited the "thick hair" version from one parent.
Genetics also affect where facial hair grows and when your beard reaches its full potential. “From ages 18 to 30, most beards continue to develop in thickness and coarseness,” he says.
Hair loss and thinning are incredibly common for people in their twenties, and when we consider the complex process of hair growth and regeneration, it's really no surprise. Hair lives in a four-step cycle — it grows, rests, falls out and then regenerates.
Despite the claims made online and by product marketers, it's not possible to reverse white hair if the cause is genetic. Once your hair follicles lose melanin, they can't produce it on their own. As melanin production slows, your hair turns gray, and then white when melanin production has completely stopped.
Grey hair and genetics
The average age for grey hair varies greatly, and one of the main causes of grey hair in your 20s is genetics. The age at which a person's hair turns grey is influenced by the IRF4 gene, and one specific variant (rs12203592) is a marker for premature greying.
It can be inherited from either parent. The color of our hair is determined by the form of hair pigment that we have. The pigment is actually produced along the hair shaft, and there are two main forms of hair pigment. There's eumelanin and pheomelanin.
Going a long time without washing your hair can cause a buildup of a yeast-like fungus called Malassezia on your scalp. Over time, this leads to a layer of dead skin cells that shed from your head in the form of oily, yellow-ish dandruff flakes. Dandruff can also make your scalp red, scaly, and itchy.
Many doctors say a daily shower is fine for most people. (More than that could start to cause skin problems.) But for many people, two to three times a week is enough and may be even better to maintain good health. It depends in part on your lifestyle.
Long straight hair
While many people associate long hair with youth, keeping your hair long and stick straight can actually make you look older than you are. Pin-straight hair puts your face front and center—including all those little lines you're trying to obscure.
Loose waves are more younger-looking, while straight hair can be aging. Play around with face-framing layers to give your hair some softness and movement. Layers can also make your hair appear to be more luscious and healthy. Parra recommends asking your stylist for perimeter layers that are cut in a straight line.
Age cannot be determined from hair, generally the only age determination that can be made from hair is if came from an infant or from an elderly person. The sex of the person the hair came from can also not be determined via hair examination unless there is nDNA evidence such as the root.