Seems to me you would lose ALOT of new people in the sport if they EACH had to be age verified to join the forum. I don't think anyone would bother, the internet is an ideal place to get introduced to something. Very few people would just go out to a field knowing very little.
If they screw up after that, nobody can blame ASC.
Also, I don't think that'd be a great attitude. You'll definitely endear yourself with the public if you take a "It wasn't our fault" approach. [insert sarcasm here]