George-
Here's my opinion if you did decide to create a teen board and a master's board. (I'm 18 by the way)
Teen board- Have a few different moderator's mainly there to control what is talked about in those boards. Don't allow any posts regarding gear or anything illegal. If teenagers were to have a question about steroids then they should take it up with the moderator's of that board through email. The downfall of having a teen board is that alot of scammers would target them to buy. Not very many teenagers have the patience or the attention span to look stuff up for themselves or even bother checking the scammers list. The board would attract alot of repetitive questions, but at least that would get them off the anabolics board. Also, instead of calling it a teen board, I would recommend calling it Under 18 or something along those lines. Here's a situation to think about- A 16 year old comes in and wants to get big as fast as possible. He sees a teenager board and a master's board. Of course he's going to seek help in the master's board just because he thinks that they will have the magical information he needs to get big as fast as possible. I wouldn't mind trying out a teen board for a while, it's not like you couldn't get rid of it easily.
Also, here's what i'd like to see done with the all the different boards.
Get rid of the pictures of men board, have men post their pics in the Anabolics board, that way people can get an idea how how guys look coming off a cycle.
get rid of the pictures of women board, have them post their pics in the womens discussion board.
Keep elite between the sheets for explicit pictures.
Make the HIV board into all STD board and pregnancy questions.
Combine counterfeit board and gear pictures board.
Get rid of the sports board and have sports posted on the chat and convo. Most people post them on the chat board anyways since the sports board is rarely viewed.
Leave everything else the same, just throwing out ideas. Great job with how everything is set up though.