the EARLY GTA games are acceptable in some areas - I have a nephew who will drive around for hours in Vice City, run on the beach, just having a blast. Doesn't break the law because the stars lead to cops. Just explores and loves the reality of it (with volume down).
NEVER would I let any of them play GTA 5. Too many scenes of sex, murder, etc. It's an NC-17 movie... it is realistic. When trevor crushes the dude's skull in the street after doggystyling his chick... it looks like a dead guy on the ground. TOO real for kids.