I started geting grey hair around the age of 14-15.
Do you have really dark hair? Dark hair seems to grey faster. If you have just a few, pluck um out.
If you have a lot you could get some highlights put in your hair to blend them in. Or Just go blonde.
I've had to put up with hair cutters making comments about my grey for years with comments like "your HOW old with THIS much grey?" I now dye my hair fresh before getting a hair cut so they can't make comments.
Hair cut people are evil