I'm 14 and I totally loved this movie. It's a really great story and it's very touching. I only checked those things in "what should other families know about this movie" because I mean your 11 year old wouldn't be into it you know? 13 and up or even 12 and up is fine. Maturity level differs among different kids. The violent part is when there's a car crash in the beginning of the moving and a passenger dies. There is brief talk about sex and a scene after but nothing visual. They do swear when mad but only a few times throughout the movie. Consumerism they like go to McDonold's.... which isn't a big deal.
Overall this is a totally amazing movie, it's one of my favorites absolutely. Everyone has their own taste in movies but if your kid is into this kind of stuff by all means let them watch it! It's nothing they can't handle.
I loved this movie, definitely a make you think kind of movie. I wouldn't recommend it to children under..14ish because it might be boring to them. I loved it and just got the DVD for my birthday. Utterly amazing.