I played computer games from quite an early age (5-7 ish I think), but the games we had then were not like today, as well as we were limited to half an hour a day. Didn't start using the internet till I was 11-ish, then the first thing I did was actually search for some cheat codes for a game I had won about 7 times.
Only really started using it properly when I was 13, and I joined a community, although then they were mostly older age group people so no real little kids.
But I think I was quite mature for my age, so as another user said it really depends on that.