There are actually two versions of the game Nier. Nier: Gestalt (an Xbox 360 exclusive title) features an older version of the protagonist, while Nier: Replicant (a PS3 exclusive title) features a younger version. Originally the team had trouble deciding on what kind of protagonist they wanted for the game so they decided to make one game with an older protagonist to appeal to western audiences and a younger to appeal to Japanese audiences. Nier: Replicant was never released in the west.