Teens White Hair

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Iam surprised to know that my son who is 16 years old has got few white hairs on his head. He has dark black hair,but i remember that when he was born and in the first few years of age he had brown hair with one whit single hair,afterwards his hair turned shiny dark black which it is known as a healthy hair. Now appeard few white hairs that makes me worry as a father, my son is a peacefull boy but a bit nervous gets excited easily,I he had ablood analysis about a year ago and every thing was ok. I wonder what the reason for that is?Is it a psychological factor, a bad way of feeding ,genetical factor,change of hair pigmentation is something could serious? or a sign of any disease .god forbid. i wish i can find an answer from a doctor,or any information that could help us to prevent that. thank you.