It began prematurely in my twenties. At first it was just a streak, now I dye my hair. Its what constant stress even as a child will do to you I guess.
I'm 47 and I started seeing grey hairs two years ago. I have a little more now than I did back then. Not happy about it, but, that's life.
My first grey hair appeared when i was 9, I haven't turned all grey though.
The moment I was born.
I am 37, and I have a little grey...I have no idea when the first strand come on through.