Question: why does hair turn gray ?

Claudia Krehl answered on 11 Mar 2013:

Hair turns grey because some cells int he body don’t produce the pigments anymore that make our hair blonde, brown, and so on. Check it out here: http://chemistry.about.com/od/howthingsworkfaqs/f/why-does-hair-turn-gray.htm

When we go grey depends on our genetics. So find out when your parent and grandparent first got grey hairs!