I was probably in my 30's. I felt so old-looking when it was getting grey. I didn't color it till Iwas in my 40's, and I'm much happier when I look in the mirror and at least I still have dark hair! (Can't do much about the wrinkles setting in) However, my younger brother is almost all gray. I had an uncle that turned gray at 16! But one of my grandmothers never turned gray- go figure!