Certain forums have certain ages, the MINI is 8-15, and boats is 30-???, everything else is pretty well mixed.
Ehh, kinda. There are quite a few more kids in the mini section, however alot of adults enjoy mini's. I now own three and I think they are great. Its pretty fun having a 50+ mph car in such a small package. As for the average boating age Id say it's around 25+ because the boaters enjoy building, where many car guys just want to drive, as well as the fact you have to be fairly close to a body of water to really enjoy rc boating, which is another reason why it's a bit limited.