*sigh*
I started greying in high school..  I'm counting on being totally grey by the time I'm 30..  I'm 28, now, and darned close..
Fortunately, my wife likes it   Says I look distinquished
  Says I look distinquished  
Yeah, sure and size doesn't matter either  

On a related note, my wife is really stressed about turning grey at 35 (I only have a few at 32)... She resents the comment that:  You are getting more distinguished, like a silverback gorilla.
I usually have to run after saying that...
My dad was grey in high school, so I know it's no big deal... as they say, it doesn't matter if there's snow in the chimney, only that there's a fire in the boiler...