I'd just say trust the ratings on the box - the ELSPA rating system is really good. If a game is E for Everyone, then it is suitable for a 9 year old. If it is T for Teen, then look at the pictures beside the rating - that explains what the issue might be (violence, racism, swear words, scary or phobia type stuff), and you can make your own decision on if your child is ready for the game. If it's M for Mature then stay away for several more years
