Eren Yeager was brought up in Marley, segregated as an Eldian. His father, Grisha Yeager, and his mother forced him to become a Warrior. Warriors inherit one of the nine Titans, one after the other. Eren possesses the Attack Titan, and he only has four years left to live as, when you inherit a Titan, you only have thirteen years left to live. He is currently nineteen years old.