The only way I can think of to do this is require birthdays as part of registration, create a specific usergroup for those under 18, and move the folks under age 18 into that group.. then deny them access to all other forums except their specific forum..
I don't know how, but I am sure at signup you may be able to do a hack where if the persons age is under 18, then it immediately puts them into an assigned usergroup.. in fact, you may want to post a request in the vB3 hack request forum for that..
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