4 1/2. This was a really good movie. Hubby and I took a group of twelve 10-11 year old boys for a birthday, our 14 year old daughter, and Grandma. Everyone loved it. There were a lot of side comments by Downey that the kids didn't really get. Some of the scenes went just to the edge but quit before getting crude. Overall, safe, clean, funny, great special effects. I would recommend this for the middle school set or maybe mature 4th or 5th graders, and up.