That's a big reason why I like Bay 12; I've been here since around 2009, and I was pretty young, and looking back, a little annoying. I assume that's to be expected, and indeed I knew at the time I was going to do something that would make me groan in the future, so the best thing to do is be manture, be smart, and above all, be quiet!
If you have a problem lying about your age for some reason, just be quiet about it. People don't tend to ask too many questions. If they do ask you, see if you can get off by saying politely "I'd rather keep my exact age a secret." Which usually works. If they keep pressing you, then leave. Be understanding, don't get upset.
MMO's like Minecraft attract griefers, and alot of greif comes from little kids trying to wave their dicks around and gather attention. Halo get's the same treatment, and while COD players would have you beilve they have less "11 year-old douchebags" (Which is true), it's replaced by superskilled pros and andult griefers, who serve the same purpose. The main challenge isn't finding a way around the wall, it's finding someone smart enough to put holes in the wall and filter the assholes from the 11 year-olds.
Off-topic: Had no idea Mexico didn't put spaces after commas. I learned something today.
Have fun with the big-ass mosquitoes down there. When I was in Mexico last, I saw one the size of a small plate. Those things kill squirrels.