Actually, I don't think a cap on one specific age down is a good idea. The problem with Trowa isn't that he's six, it's that he's six and is involved in posts and Cr that aren't necessarily appropriate for someone of his maturity level. I think it would be more beneficial for mods to look at that in a prospective character than just their age. We have child characters who are well past some of the adults in maturity and can handle the darker elements of the game just fine. As it's been pointed out before, Calvin has a college level vocabulary and despite his age has done just fine.

Like I said, it's subjective. It's also something the mods wouldn't implement any time soon or without extensive discussion with the playerbase, so there's no reason to get our feathers ruffled over it.