i heard windells has more younger kids there than other places, like more kids under 13 or so, and not many kids like 15 or 16-25ish.   though i was there a couple days last summer to dig and ride and it seemed like there were alot more older kids on the hill, but they could all have been coaches and workers that i was seeing, who knows?
if you really wanna be with more older people go to momentum or coc, those camps have tons of people older than like 25 so you should be right in the middle.
i wish i started going to camps when i was younger, my first camp was at like 16, then 17, and then ive just been doing the public at mt. hood and digging to ride at places, you get like 3 times as much skiing, and no rules at all, you just camp and fuck around all the time.  but you dont get to be around awesome people all the time like you do at camps.