darthmunky said:

Anakin is not going to look like Hayden for the simple reason that Vader died as an old(er) man, not as a young Hayden. Look at Yoda and Ben; they are not their younger selves, but as they were when they died

Yes, but apparently when Anakin turned to the dark side, he became Darth Vader and Anakin died. Obi-Wan and Yoda even said that.

That is Lucas point of view indeed, and why not. But "there is still good in him..." after all, so you can also say that at the end of ROTJ it is Anakin who died. And we even see his face as an older man. So it is jarring to see Hayden's face at the very end (specialy if you choose to watch ep 4-5-6 before ep 1-2-3).