17; I have grey hair, people say it's wisdom hair or it's because I'm under stress be's the reason. I don't comply, why do I have grey hair at age 17?

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 –
Genetics. If you father or mother had grey hair at a young age in all likelihood you will too. Check back in your family tree and see how many persons became prematurely grey.