I have three sons- ages 5 (nearly 6), 9, and 11. All of which have expressed desire to play Aces High. The only way I would allow it at this point is if the H2H feature was still available or use the offline mission feature. Although the .squelch tool is readily useable, you cannot guard against the inevitable "^&*#!!" that slips through before you impliment it.
My sons do have the realization that some adults act less mature than some kids, so for the most part they can overlook the occasional slip. It's a parental judgement of maturity, but it does not excuse the community or my kids from governing themselves.