Louis Lowry's The Giveris developmentally appropriate for an upper elementary to junior high setting, beginningg with the 5th grade and up. The reason for this is because students ages 11 and up are ready to conceptualize dystopian novels and dystopian societies, and know how to differentiate fantasy from reality.
The Giver presents a good message that can appeal to that age group as well: Pain and suffering are not options, but neccesities for human development. Pain can teach us to become stronger and better individuals. Therefore, to avoid or erase pain is equal to denying ourselves from our humanity. This is a very good point to make in a group of students of ages in which pain will present it self for the first time. It is also a story with a good axiom to put forward for students of that generation.