Your hair turns gray or white from a loss of melanin, a pigment-producing component that produces melanocyte cells. These make up your natural hair and skin color. The less melanin you have, the lighter your hair color. Gray hair has minimal melanin, while white has none.
The pigment in our hair is caused by melanin— the same pigment that is also responsible for our skin color. Gray hair is caused by a loss in melanin, whereas white hair does not have any melanin at all. As you age, your hair produces less and less melanin that leads your hair to appear gray, and then eventually white.
As you go through the aging process, your hair might turn grey before going completely white. For some, this process is so drastic that the hair simply turns silver and then white. According to some hair color experts, what you see as grey is a product of the mix of your natural and white hair.
Your hair doesn't turn gray — it grows that way.
A single hair grows for one to three years, then you shed it — and grow a new one. As you age, your new hairs are more likely to be white. "Every time the hair regenerates, you have to re-form these pigment-forming cells, and they wear out," says Oro.
Gray (often spelled as grey in the UK) is an optical illusion. In actual fact the strands of hair which are always white, only appear gray because they are mixed with the remaining, naturally dark coloured hair. This explains why many people, not only Americans, say they are going gray.
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 use “gray,” “white” and “silver” interchangeably to describe hair that is turning or has turned. Its appearance — whether it looks, gray, white or silver — depends on how much natural color, or pigment, remains, experts say. Hair that has lost all its color typically appears white.
“Plucking a gray hair will only get you a new gray hair in its place because there is only one hair that is able to grow per follicle. Your surrounding hairs will not turn white until their own follicles' pigment cells die.”
Genetics
If you notice white hair at an early age, it's likely that your parents or grandparents also had graying or white hair at an early age. You can't change genetics. But if you don't like the way your gray hair looks, you can always color your hair.
Silvery strands are one of the more conspicuous signs of aging. That said, getting gray hair doesn't necessarily mean that you're closer to the end of your life span than anyone else your age.
Don't assume that grey hair makes you look older
Hair naturally loses pigment as we age, but stylist Paul Falltrick points out that the notion that grey hair makes you look older is increasingly becoming a misnomer: "Grey shades can be stereotyped as ageing, but a clean-looking grey is stunning" he says.
According to hair biology experts and styling experts alike, grey hair is more resistant to color than younger hair because of its texture. The relative lack of natural oils in the hair compared to younger hair make it a rougher surface that tends to reject the color being applied, especially around the roots.
Gray hair has a different texture because your hair loses the pigment or melanin and the hair follicle doesn't produce as much sebum. 3 The sebum is the oil your body naturally produces to hydrate your hair. As a result, gray hair often feels more coarse, dry, and wiry, but using the right hair products can help.
A new study shows that stress really can give you gray hair. Researchers found that the body's fight-or-flight response plays a key role in turning hair gray.
But white hair can appear at almost any time in life. Even teenagers and people in their 20s may notice strands of white hair. The human body has millions of hair follicles or small sacs lining the skin. The follicles generate hair and color or pigment cells that contain melanin.
Vitamin B-12 is the most common culprit, with folate, copper, and iron deficiencies increasing your risk, too. Dietary supplements may help these deficiencies and you might see your natural hair color start to grow back after several weeks.
Although the primary cause of premature hair graying (PHG) is considered to be genetic, certain environmental factors also play a role. Trace element deficiencies such as Vitamin B12, Vitamin D3, and calcium may also be associated with PHG.
Poliosis itself is simply a harmless lack of pigment in hair follicles, which causes them to become white or gray. The condition can exist from birth, or it can appear without warning at any age. While there is no need to be alarmed if poliosis appears, it is best to see a doctor if it does.
Just like one finds grey hairs on the head upon ageing, appearance of grey hair on the eyebrows is also a sign of ageing/premature ageing. While for some, these signs start showing up in the 40's or 50's, some folks encounter the problem of grey hair on eyebrows in their 30's.
For men having white hair was a sign of distinction, hinted at nobility, and was even a sign of virility. It couldn't have been more different for women. It was a sign of their deterioration with age, and the end of their fertility.
At a Glance. Stress can cause hair to gray prematurely by affecting the stem cells that are responsible for regenerating hair pigment. The findings give insights for future research into how stress affects stem cells and tissue regeneration.
Is White Hair Natural? There are many natural hair colors, including brown, black, blond, and ginger, but white color hair does not come under the list of natural hair colors. However, some people with albinism can have entirely white hair, and so can people with other diseases like vitiligo.
Only about 4% of people have naturally gray hair. Mainly older people make up this percentage, as well as a few young people who have grown gray hair prematurely. What is this? Older people usually have hair that ranges from silver to gray.
As we mentioned, gray hair's lack of sebum can make it feel dry. To reduce further dryness, you'll want to wash it as infrequently as possible. "Washing every other day or three to four times a week can help with this," says Mazzei.