I'm 15 and I play. Most people think I'm older than that until they either hear my voice or I tell them. Everyone tells me I'm mature for my age, which is fine by me. Less people complaining
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Personally, I think that "teens" should be allowed to play, but not younger kids. I've met 12 year olds that play and are immature as all get out. They constantly complain and talk CONSTANTLY on a microphone. This is when people complain: when 12 year olds talk on the mic, not when teens do. Most people don't have a problem with teens playing until they find out their age. Then they start making fun of them, yelling at them, telling them to leave, etc. and it gets out of hand.
But yeah, I don't have a problem with "kids" as XTR3M3 puts it, just as long as the true kids don't use a mic.