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Changes in hair colour typically occur naturally as people age, eventually turning the hair grey and then white. This normally begins in the early to mid-twenties in men and late twenties in women. More than 60 percent of Americans have some grey hair by age 40. The age at which greying begins seems almost entirely due to genetics. Sometimes ...
This overproduction causes depletion of the melanocyte stem cells which are required to produce melanin, the pigment responsible for hair color. [ 2 ] Premature greying of hair has been observed with greater frequency among certain families, suggesting a familial predisposition for the condition.
The Fischer–Saller scale, named after Eugen Fischer and Karl Saller is used in physical anthropology and medicine to determine the shades of hair color. The scale uses the following designations: A (very light blond), B to E (light blond), F to L (), M to O (dark blond), P to T (light brown to brown), U to Y (dark brown to black) and Roman numerals I to IV and V to VI (red-blond).
The slightly more scientific answer is that as your hair follicles (and you) age, they produce less color, so when you go through the natural cycle of shedding and growing new hairs, they’re ...
And research suggests stress can also play a role in hair color, as can sun damage. “While getting gray hairs is normal as we age, excessive sun exposure can accelerate this process and lead to ...
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