George Clooney went grey early. He's doing OK. Of course, he changes his hair color when he needs to for a role, or just wants to for the hell of it. Things could be worse. You could be allergic to hair color, which is my problem, besides not having much hair.
What's wrong with grey hair? As you grow older the color of your hair will be the least of your worries.
Thanks for the responses. Good to see that this is normal. I was getting worried since I've never met anybody in their early 20s with gray hairs (let alone thinning/balding/white). I'm gonna keep my stache, like my 70s look.