[Blarg]

Glasses and facial hair make me look older. So does wearing conservative clothing. I look younger wearing t-shirts and jeans. It's probably the same for most people.

I agree with one of the other posters who says that girls in the age range you're going for are often very attracted to older guys, though. Caveat: they often assume they have money. Your "sophistication" quotient goes down if you're just older but don't have money.