Because the game itself is quite attractive for kids, Lego-like building and stuff.
I got my little brother into the game as well, he is probably annoying some of you guys on the server saying nothing when you ask him something. :P
Anyhow, yeah i'm 20, almost 21.
Got in here about 4 years ago when i was 16.
Some of the 'younger' people really make me jealous though, they do stuff i can't but wish i could.
I feel like an old grandpa now.
Great.