On some levels I agree with you (although I'm not sure how much my answer matters to you considering I'm a "youngon" myself). Some under 18 users clearly can't handle themselves. I think I can. Or at least that's what I've been told. And even with age restrictions on websites kids still find a way to get in, you have to know that, and lying about their age seems to be an easy slip through the door. I understand your concern, but please don't judge me on my age, judge me on what I provide to GaG.
In some topics absolutely, in no way do I want to answer sexually related questions that are asked by someone under 18, but at the same time here, some of the younger kids are pretty insightful for their age, so I have mixed feelings about it, of course some of just absolute trolls as well lol.
I get what you mean though about being uncomfortable and weary of what you say around them though.