I would say there`s only a few guys out there that are under 18 that could get together to form a Team to a competitive level because of the costs = they just couldn`t afford it ?? without relying on their Parents or friends, and that, I would think would be short lived.
Paintball is aimed at a higher age in general, don`t get me wrong as ALL KIDS want to shoot guns? and also Dads feeling the Buzz of playing also sometimes want to get their sons into the game, again when a Team take on a youngster with Dad paying the bill very often the Team don`t want them because Dad wakes up after a short while realising the cost of the son playing, then pulling him out because he can`t afford it, leaving the team with a man down after all the training and gelling with that team, That`s why Teams don`t have Kids.
I would say perhaps your one of the lucky ones that can afford it and would recommend you jumping in with a team that`s ongoing and to learn the skills with the high`s and the low`s.
Kids teach you nothing and are sometimes a pain in the Neck.