[Request] Age Filter For Threads

[GekkoPixie]

What I am looking for is one of two things, both with the same result. I would like a modification that will allow users to tag their threads as 'mature' or 'adult content'. This tagging process will refuse access to that thread for anyone under 17-18 years of age, based on the birthdate entered in people's profiles. The other option would be to have some kind of mod that doesn't allow people under a certain age to view threads with certain words anywhere in the thread. I'd prefer the first one, though. It would have to block even moderators under the age limit, though Super-mods and Admins would just have to deal.

I can afford to pay a small fee for this mod if necessary, though I think something like this could be very beneficial to many sites.