Why do they have to be your age? When I was in high school I was always jamming with guys a lot older than I was; I was a freshman, they were juniors and seniors. (I guess that there just weren't enough keyboard players around). I definitely learned a lot from the older guys.
There must be a media club in your school; also, most probably, a drama club. Join both. That gives you access to "toys" (cameras, audio gear, etc.) and actors. There's probably a writers club as well. Even if they are not specifically film they are related crafts and will be quite helpful.
Also try MeetUp.com. I'm sure that one of your parents will have to attend with you, though.... Then there's the usual suspects - Mandy, Craigs List, etc. Work on every indie set you can in whatever capacity you can - extra, runner, gopher, PA, etc.