Video Games Under $10

Why are children under 14 years of age and sex play violent Video Games?
My brother is 10 and plays things like "MedalOf honor "and the Rebel Raiders" and the elders of his cousin of 15 years or 14 years who plays "City Theft Auto" or whatever. Personally, I think this must stop. My brother is a bad example for his three years. brother teaching him to fight! HEEEEEEELLLLLPPPPPP !!!!!!!
I agree 10 Old I do not think one year must be resistant housing with a year of three years. Besides, I like games that have sex, blood and struggle. Children immune and even adults, to the horror and when it happens to them, nor anyone in real life they do not fall into it! What the world ?!?!?!?