11 year old will be fine. Any younger, it would depend on the kid.
I wouldn't say the parts i am thinking of are not as disturbing as some of the stuff in Dark Knight.
If you want more info check the box. i didn't reveal anything major to the plot, just some stuff for people to watch out for if they are going to take their kids.
I could see the opening bothering some children, it's a war montage, but it's not nearly as bad as say Saving Private Ryan. There is an implied impending rape in that opener.
An innocent elderly couple is killed very suddenly and that upset me a bit, a sensitive 11 year old might have a hard time with it.
Mainly it's just lots of bloodless killing and a few sudden deaths of innocent people that I would be worried about. Victor Creed /Sabertooth is very cruel, in character, but still.
As for cussing all I remember was a few g/ds and then the milder words
The nudity in the rating refers some man butt and side shots of him running,so a young daughter might get a bit embarrassed if she is innocent. No sex, no drugs,a little gambling and like i said, LOTS of fighting. But it's Wolverine, i mean, it's expected...
Oh, and if it bothers you, i know it does some people, Logan IS a smoker, lots of cigars.
Hope that is helpful to someone