Ahh, this good old debate. Am I the only kid who wasn't really interested in GTA growing up? Even now I'm sitting playing hack'n'slash fantasy games while my mates are playing CoD:MW2. I don't care about shooting people in a realistic environment, I'd much rather play a more escapist game where I cut through demons with a giant sword. I like fantasy, not realism.
Anyway, I agree with Rockstar. If you buy an 18 game for a 10 year old then you're not doing a good job at parenting. I know a lot of my friends had GTA games when they were 12 and it was mainly for bragging rights (I think) but I was never that interested. I knew my parents wouldn't buy them and I was happy with the games me and my brother had.