The medical term for hair graying is canities. Hair turns gray (or white) when your hair follicles stop creating melanin. Melanin is the substance that gives your skin and hair color.
The idea that a stressful season of life is "giving you gray hair?" It's not a euphemism. "Research has linked stress with premature graying, as seen in studies on mice placed in stressful ...
If you are below 30 and already have grey hair, you can blame your parents. Apart from genetics, there are other reasons for premature greying, however, including nutritional deficiencies and stress.