It is an old comedy. Set your expectations at crude slapstick. It is just silly funny, nothing more, nothing less.
Kids think it is silly. There isn't anything educational or to gain. Again, it is just a big joke.
Iv'e Never seen it but it doesn't seem terribly innapropriate. I think they Should of rated it PG 13 but, Whatever. It seems like one of those movies that could go either way. It seems to me that it would be iffy for ages 12- 14. but ok for ages 15+