I would wait until you around thirteen for multiplayer in this game cause players can be very toxic and mean. Zombies can be scary and slightly more gorey but isint bad if you have the settings turned down. If you are into war and history, than this game would be perfect for you.
COD is a great game for teens and young teens alike, and is so popular between the ages of 12-17. Many parents may be skeptical about letting their child play this game, but lots of the features that make COD seem bad can be turned off in settings.