I think the one who started this thread should ask his Guild Leader to visit GWGuru and check out this thread
Looks like we PvE-fanatics are mostly over 13 (me being over 30 too), most of us have life (not me), most of us even do PvP too (not me).
And what comes to kids (I call kid everyone below 15, I sincerely apologize if any of you younger people find that offensive) I have met quite a bunch that have shown such a maturity I could have said they were about my age.
Of course each one of us have met the Obnoxious Kid, who insists to join a guild, you let him in and he starts asking could you make him an officer. You state no, and he starts asking for money. You say no, again, and he starts calling you all n00bs etc and leaves. That's so common... and spoils the reputation of the majority of kids.
While I was still playing on European servers, I met and teamed up with a group for mission (can't remember which... Frost Gate, I think). Everything went smoothily and we got it done rather quickly. The team didn't break up after it and we had a nice chat there, and I found out that the oldest of the rest of the team was 15. You couldn't really tell it from their speech or their behavior. They assured me not to judge anybody on GW before getting to know them better.