Animated movie at Cannes

Ebert talked about this film in his online journal (he's so excited to be at Cannes). He mentions something in that piece that struck me: animation has the power to convey aging very well. A drawn character can age believably over time in ways that a child, adolescent, and adult actor, heavily made-up for youthful and aged portions of a film. What else can animation do better than live action?