hiding forums based on user age

[phlogiston]

Yes indeed

I'd suggest making the terms of joining the group that they must paste the link to the ID scan in the join reason ipnut box but I'm not certain how successful that would be with people not reading instructions!

Maybe someone else has simpler ideas of using profile fields to figure forum permissions, it'd definitely be a nice addition. Similar to Promotions I'd guess, rather than basing the promotion on rep or posts, base it on entering the correct value for a custom profile field.

In fact, try a search here for "custom promotions" it may yield a solution