Now I’ve played BO2 and it’s great! The zombies mode is full-on perfection, The campaign is alright… and the multiplayer is nostalgia (especially the emblems), The storyline fit really well into the game’s atmosphere IMO, For parents reading this, Your child can IF they have the content filter on which can be accessed via menu settings, basically it disables swearing which will change character quotes, gore, blood, and explicit scenes that contain death in front of the player’s eyes, if a scene isn’t disabled and it still comes up, it will have blood off but most of the time they’re are disabled, I’d say the game helps the child know what war would be like if they were in it (not that they will nor does it help them, it just gives them a better preview), away from the parent stuff, the game introduced choices, pick 10, modes for zombies (Turned, Grief etc.), it also introduced crafting for zombies
Other than that with the filter on, I’d say the game is 12+ or 13+