Gray hair is one of the universal signs of advanced age. More likely than not, at some point in your life, your hair will start to go gray. Some individuals can maintain hair color well into their older age, but most do not.
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.
To keep your gray hair healthy, try to avoid over-using heat tools and styling products, as these can lead to unwanted yellow tones in your gray hair. If you do use heat tools, put them on the lowest setting and use a good thermal protectant. If your gray hair yellows, you can try purple shampoo or a purple mask.
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 we get older, the pigment cells in our hair follicles gradually die. When there are fewer pigment cells in a hair follicle, that strand of hair will no longer contain as much melanin and will become a more transparent color — like gray, silver, or white — as it grows.
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.
Genetics
Your makeup plays a big role in when (or if) you develop white hair. 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.
Hair color is due to a pigment called melanin, which hair follicles produce. Hair follicles are structures in the skin that make and grow hair. With aging, the follicles make less melanin, and this causes gray hair. Graying often begins in the 30s.
Dr. Kraleti doesn't recommend plucking or pulling the hairs out. “If there is a gray hair you must get rid of, very carefully cut it off. Plucking can traumatize the hair follicle, and repeated trauma to any follicle can cause infection, scar formation or possibly lead to bald patches.”
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.
It is normal for hair color to change, as people age. But white hair can appear at almost any time in life. Even teenagers and people in their 20s may notice strands of white hair.
White hairs are typically a sign of aging, but they're not timekeepers — they can pop up whenever they feel like it. That being said, it's common to notice white or gray hairs in your 30s or 40s.
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.
The vast majority of people with gray hair have age-related graying. However, sometimes graying hair indicates an illness, especially if it occurs at a particularly young age. Health problems that may be heralded by gray hair include: vitamin B12 deficiency.
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.
Harvard researchers have found that acute stress hyper-activates the sympathetic nervous system, which rapidly depletes the stem cells and leads to hair graying. (Image: Hsu Laboratory, Harvard University.)
Vitamin B12
Elevated homocysteine levels in the body generate hydrogen peroxide that bleaches the hair, turning it gray. Taking vitamin B12 supplements reduces homocysteine levels and prevents premature hair graying. Intake of foods rich in vitamin B12 like meat, eggs, milk, and fish can help in gray hair reversal.
Luke's Medical Center, points out that apart from aging, other causes of white or gray hair include genetics, stress, lack of nutrients, and autoimmune disorders. So if your parents developed white hair early, chances are you are prone to premature graying, too.
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.
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.
It can be a shock to find your first gray hairs on your head, especially if you're only in your 20s. But women's expert Dr. Kirtly Parker Jones says a few gray hairs is perfectly normal, even for women in their late 20s and early 30s. However, stress, genetics and other factors can play a role.
And while it may seem intuitive that stress can accelerate graying, the researchers were surprised to discover that hair color can be restored when stress is eliminated, a finding that contrasts with a recent study in mice that suggested that stressed-induced gray hairs are permanent.