I mostly lurk (very rarely post), but this thread was tailor-made for me. I started going gray at 16 or 17. Now I'm 28. I have lots of gray hair throughout my entire head, and one big patch of white hair at the top of my head (think Rogue from X-men, except not quite so symmetrical or esthetically pleasing).
Sometimes I dye it, but my hair grows fast and then I get awful roots. Besides, dyes are just so caustic...I hate how my eyes and nose feel when I'm doing it. Other times I just let it grow naturally. I don't really mind the gray, except that the hairs seem coarser and more prone to frizzing and looking dry. I have curly, frizzy hair so I've been fighting on the hair front most of my life! (As an aside, I have to say that Curly Girl -fluff that it may be - did a lot to help me love my hair.)
The funny part is that I get lots of compliments on my white hair - ALL of them from women who are over 40. I've never been complimented on the white by a man or by a young woman (except for my sister, who has an obvious bias). Also, when my hair is freshly-dyed, everyone tells me how much they love it. I'm vain and I LIKE getting compliments on my hair. Go figure.
My second graders always draw me with bright crayola-orange hair. Not sure why, since my hair is brown. When I taught seventh grade, the girls asked me if I used spray-on hair colour for my streak. Before I could answer, they quickly added "because you really shouldn't".
Meh. Hair is hair. Sometimes I love it, sometimes I don't.