Attack on titan is my favorite show I have ever watched. I love the animation, fight scenes, and life lessons I was taught in this anime. I think ages 12-14 are aloud to watch it, it depends if she/he can handle gore, violence, and blood. There is no nudity or anything inappropriate, though there was this one scene in ep1 season3 but it was like 3 sec long, it was a small scene and i actually forgot about it. As far as swear words, i never heard them say the F word, and they do say the b word, but not that much at least 3-5 times throughout the 3 seasons and they do say the s word aka (poop) 3-7 times throughout the show. I highly recommend this great anime.