Scientists still don't know why some people turn gray early, late, or not at all, although they suspect genes, nutrients and possibly the immune system play a role in depleting melanocyte stem cells.
"While it's a natural part of aging for most of us, not everyone automatically turns gray when they hit the age of 50," she says. "Some people in their 80s don't have gray hair yet, while others get white hair in their late teens," she adds.
In those aged 56 to 60, 86 percent had some grey hair, with almost a third of their head having been covered. But not everyone in their 60s had grey hair. Researchers found that 91 percent of 61 to 65-year-olds have, on average, 40 percent of their hair going grey.
In time, everyone's hair turns gray. Your chance of going gray increases 10-20% every decade after 30 years. Initially, hair is white. It gets its natural color from a type of pigment called melanin.
The primary — and most scientifically-sound — reason for gray hair is in your genes. This is especially true if you go gray before 20 years old, which is referred to as premature graying. If your parents developed gray hair at a young age, chances are you will, too — and there's not much you can do about it.
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.
Most people start noticing their first gray hairs in their 30s—although some may find them in their late 20s.This period, when graying has just begun, is probably when the process is most reversible, according to Paus.
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. Your hair color is determined by pigment-producing cells called melanocytes.
5.87% – 41-45 years old. 2.85% – 51-55 years old. 0.95% – 56 – 65 years old. 0.007% – over age 66.
Normal aging is the biggest culprit.
Dermatologists call this the 50-50-50 rule. "Fifty percent of the population has about 50% gray hair at age 50," says Dr. Anthony Oro, professor of dermatology at Stanford University.
They found that the timing and extent of grayness depend on genetics and ethnic heritage — and that your chances of going half gray at 50 are less than 24 percent.
Make Sure You're Getting Enough Vitamin D
There are a number of dietary deficiencies that science shows can contribute to graying hair. Vitamin D is one of them. One study published in The International Journal of Trichology found that children who experienced premature hair graying had low vitamin D levels.
Dr. Jennifer Chwalek: The process of hair changing from darker color to white or gray with age is mainly due to genetics. It can be inherited from either parent.
Your hair follicles produce less color as they age, so when hair goes through its natural cycle of dying and being regenerated, it's more likely to grow in as gray beginning after age 35. Genetics can play a role in when this starts.
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.
Premature graying may be reversed with vitamin B12 supplementation only if vitamin B12 deficiency is the cause. If you are graying due to other factors, such as genetics, zinc deficiency, and medications, your gray hair cannot be reversed.
Substantially More Grey Hair
om weak or dead hair follicles, lack of a proper sleep cycle can also cause your hair to grey faster than it would normally. That's because the hormonal imbalance that follows when you're not sleeping properly, makes your body produce less eumelanin, the pigment that makes your hair black.
As we age, some pubic hair thinning, or loss, is normal. However, certain conditions like alopecia or an adrenal issue can also cause hair loss.
However, the rate of hair colour loss is largely determined by your genes. The chances are that you will experience premature greying if your parents do. However, certain nutritional deficiencies and underlying medical conditions may play a role. In these cases, yes, white hair can turn black again.
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. However, the speed that your hair loses melanin is largely attributed to genetics.
Gray hair comes down to melanin, or rather the lack of melanin. Melanin is the pigment that gives hair its color. Gray hair has reduced melanin, while white hair completely lacks it. This occurs because of a gradual decline in the number of stem cells that mature to become melanin-producing cells.