Shouldnt be any moderation except for spam..If your dumb enough to let your 9 yo roam freely online in chats their gonna find the bad stuff eventually.
I know plenty of 13+ who play. I started when I was 14. I had already lost interest by the time I was 16 but from time to time I come back for a few months at a time. But I would love for it to be at least 13 plus so that morons stop saying "this is a 9 plus game why are you having this intelligent discussion" It should definitely be raised to 13 if it isn't already. There's too much moderation here - perhaps an optional chat filter would be nice.