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As you age the follicles lose their pigmentation. Hair isn't actually grey its white, but it looks grey Why hair turns gray as we age. Premature graying can happen at any age ... generally from the 20's up. I knew a young man in Elementary school who had a tin can thrown at him which cut the scalp and he had a patch of white hair about two inches in diameter. The cut had caused damage to the hair follicles. Gray hair can be hereditary and some young people may be what they call, 'salt and pepper'. It's genetics and it's no different than a 20 or 30 year old male going almost bald. These hereditary factors generally come from the mother's genes when it comes to hair loss. Not all people that are getting older get gray hair. I am 65 and don't have one strand of gray hair (my mother didn't either) and my father had what I refer to as 'silver wings' just gray hair on the side of his head. Once hair is gray it becomes coarse and it's 'dead hair' and there is no product out there that will reverse this short of dying. Gray hair also absorbs dye very quickly so if a person has black hair they are better to get it done professionally. It is true as the above poster says that there are certain medical treatments and disease where the hair may revert back to colour (and it won't be exactly the same colour as they had before; perhaps a shade or two lighter.) As we get older, 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 transparent colour like gray, silver or white. When people get older, fewer cells will be around to produce melanin. The age which you go gray (or white) is determined by your genes. Answer by Ashlyn Summersett because there are pigments in your hair that contain melanin, which gives your hair its color. Overtime, these pigments die off, and there are only few pigments to make melanin. When your hair runs out melanin is doesn't make any color. Therefore, itstead of a color, your hair becomes a transparent color such has gray, silver, or white. Why does the skin of the fingers and toes become wrinkled after prolonged immersion in water? Best Answer: Because the skin has adapted to function in an aerobic medium ideally.... You have dead layers of skin cells over your living flesh as a protective layer against water getting in.... but that's not to say that the water cannot get into the surface cells... dilute them... expand them ... and... well... if all the cells are expanded but held in a limited area then they're going to wrinkle.... Why do goldfish jump out of their bowls? Goldfish may leap out of their tanks if the water is too warm, or if it is not at a proper acidic level. Irritants building up in a tank that has not been cleaned recently, external parasites, and lack of oxygen in the water from waste gas build-up are also common causes for this mystifying behavior.