A member asked:

Why does our hair turn white vs gray when we grow old?

A doctor has provided 1 answer

Genetics: Our hair is generally preprogrammed by our genes to stop making pigment that gives it color. Rarely, a medical illness, stressors or medical treatments, like chemotherapy, can change our hair color or cause a lack of color(white or gray). Ask older relatives when they saw their first gray hair.

Answered 6/28/2013

5.7k views

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