Im 16, just got into, but i know people younger who have been into it for a while. I've found that sup'air is played by alot of the older guys, by which i mean late teens and up. Whereas recball...i dont know...but quite a few of the younger players, by which i mean early teens.
Though i think that there are now university teams and university leagues so the older variety will be getting a lot more involved, especially when paintball makes it's way onto TV