Not to be a douche (more than I already have been), but I wouldn't mind if younger people had more trouble playing. Little 13 year-old brats are a large part of what spoiled WoW for me so much. I would love if a game had 18+ servers that required verification. Sure a few kids would slip through on their dad's account or something, but at least it would be minimized.
That's what drives so many people to RP servers. It's not that they want to RP, but that RP servers are kryptonite to little boys with fragile egos because they are so uncool.
Before some tween comes in here and goes off on me, I'll say that not all kids are like this. I played with a very talented 14 year-old in WoW. His prepubescent voice was mildly annoying over vent, but he also didn't whine with it and was a great player.
The small, but vocal minority always seems loudest.
So yeah, for me, I'd rather never have to play with teens at all.