eh don't stress about it Stefan....some guys look more distinguished when they start to grey (Matt Lauer as an example...and he's pretty hot for an older guy!!!
). My one uncle was completely grey by the time he graduated high school when he was 17. And I have a friend that I've known since I we were 19 and he has this small (dime-sized) patch of white hair on the side of his head. And if it bothers you that much and you start to get more, you can always get your hair colored.