See GYN: If its only few grau hair its not unusual. But if you have a lot at age of 21 its either genetic or some kind of a deficiency, you better see a doctor.
Answered 1/7/2018
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Reasons to gray : Early. 1.Genetics. 2. Age 3. Stressors. The age of initial graying is largely due to genetics. Stressors like nutritional deficiencies, traumatic head injuries, low Vit. B levels, zinc deficiency, severe illness, surgery & marked emotional stress may cause earlier depigmentation in people who are predisposed to gray hair. In general– genetics plays the biggest role.
Answered 11/13/2018
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