What age would you recommend the book Dear John for?

Probably, I'd say thirteen, if you're asking what age can you read this. But if you're asking what ages would read this, I'd say Teenages, and Adults, or maybe people who are into the Army, Romance etc. stuff. The book is really, really, really good. I read it ! Haha, but there is a scene where they do make love, but that's just to only part. It doesn't really go into detail. But other than it's good, appropriate etc.