What could be a reason to get gray hair at 31 years old?

Graying of hair is: Related to genetic predisposition. Age of initial graying is largely a matter of genetics. However stressors: nutritional deficiencies, chemotherapy, traumatic head injuries, low vitamin b levels, zinc deficiency, severe illness, surgery ; marked emotional stress may impact earlier depigmentation in people who are already predisposed to gray hair. Aging is a significant factor. In general –.