Age restrictions /are/ retarded. Speaking from my point of view, more servers should just do simple tests before they accept a player.
When I run a server, I tend to have a whitelist. For every person who wants to register, I run a 5-minute conversation with them to get a feel for who they are and what they behave like. If it's a roleplay server, it's also a perfect chance to laugh at their OC give some constructive criticism so they don't make the same mistakes again. Remember, it's easy to ban someone, it's harder to teach someone something.
Down to the point of deliberately lying to you? That's not being an adult, that's being an asshat. I would NEVER keep a liar on any of my servers, no matter how noble his lie would be - and I had this problem sometimes.
Also, just because you're 25 or 30 doesn't mean you're mature. I met some people who are in their 20s and can barely keep themselves clean. As I said, a talk with every player beats an age restriction any day.
If you want to alienate young people, fine, but they will never learn unless someone teaches them something. If you want to contribute to a society full of asshats, go ahead, but I'm not doing that.
And yes, I have spent months teaching a 13-year-old how to behave on one of my servers. It actually worked. On the other hand, some people older than me have managed to play on my servers for 1.5 years before destroying them.
There are 1%'ers on both sides. Your argument is invalid.
