Divergent

A page-turning formulaic young adult novel featuring a lead young female protagonist that has been extremely successful. They are making it into a movie and the novel leaves plenty of room to imagine what each and every character might actually be like so I suppose that made the writers and director happy. The dystopian future is a world divided up into factions based on general traits (the really smart faction, the truth-telling faction, the brave faction, the selfless faction). Kids chose factions when they are 16. This first book spends all its time in the long initiation rites for the main character's chosen faction. No old people in these worlds. I guess they are all dead or extremely quiet and inconsequential.