MathUser said:

It's prettty stupid, he saved him so he's at the point before he became evil right? That's why he gots normal color for his skin and normal body parts? But for some reason he's aged. Did Luke somehow create an alternate timeline or something?

There sure is an endless supply of PT lovers who come up with this stupid argument.

First of all, it is not that Luke saved anyone. His presence just triggered Anakin's return who then saved Luke. The old guy that died was Anakin... the Anakin Luke met and knew. It is only reasonable to appear in the age that Luke is supposed to recognise.