Pst.. The reason for why I made it 18 and up is because I don't want to have to worry about teenie-boppers and their parents and because then, lets say someone under the age of 18 decides to drink and does something stupid, I don't really want to be held accountable for that as it will cause me (and everyone else) some issues with the legal system.
+18, you're an adult and you can take care of yourself. You're liable for your own actions so if you decide to do something stupid, it's your own consequences (not meaning for that to come out the way it is, but I've had run-ins here where someone under the age of 18 would get pissed off for the stupidest shit and then make some rather stupid claims, getting others into trouble).
There may or may not be exceptions made, it's just a matter of understanding your situation. Of course, if you're emancipated and 17, I'm not going to freak out about it.