That's a lie. I'm older than half my classmates, but that still doesn't get me any action. Then again, I also look like a 12 year old...
How much older? That's an important aspect to look at.
Besides, us "older guys" are no more than 19-20 and the "younger chicks" are USUALLY off-limits then. Sure, if I were single I probably wouldn't turn down a 15 year old, but the legality of it still stands.
I'm now a junior in high school, so I would guess anywhere from four months to one and a half years. And yes, I do count underclassmen as my classmates.