What to do if I like an older guy?

Don't get your hopes up too high, but it could work. Especially for girls, because girls mature faster than boys, so it evens the playing field. There is a chance you will be liked back! If the guy shows an interest in you, go for it! But do not try to hard, other wise you may be known as the little kid obsessed with him. Good luck, and remember, there's plenty of fish in the sea!