My eldest daughter who is at her mid-20's started noticing a few strands of white hair growing on her hair. She's a little worried since she knew grey hair would come out only when you're aged about 40 and above. Well i really I can't answer her and all I know it's part of the aging process. But she's only 26?

Are there any reasons why she has white/grey hair at her age right now?

If I could remember it right I started to have white hair when i was in my early 30's..so my another guest is that it could be something to do with the genes inherited from the parents.