I wanna tell you the truth.
I bought the game twice, one for me (im 28) and one for my 12 year old sister.
She loves Gta and played it for about 2 years now.
She doesnt care much about the brutal things. She is more interested on the horse and the things around.
No children of the world will be a "killer" because of a game like this and they can make a distinction rlly well between a game and rl.
Sry for my Bad english, i did my best
edit: i also played games like doom or other shooter / horror games when i was 10 and i think i got not so much damage from it