If you're massively self conscious about it, get some dye or something. Like most things though, it's how you carry it off. If you accept it, it'll be fine. As Mr.Confident suggests, there are plenty of people with "salt and pepper" hair that do alright for themselves! I'm going bald (receding hairline coming in) and I'd much rather be going grey than bald, I can tell you. I can work round the thinning and the balding at the moment, but give it a year or two and I think it's going to have to be buzz cut/number 1 all over time
Give me thicker grey hair any day of the week!!