As far as I'm concerned, Lucas completely screwed the continuity of star wars. First, Anakin turned good at the end which means the age of his spirit would be the same as when he died, like Obi-wan. But who am I to talk? Quigon didn't even disappear when he died. The only way this would make any sense is if Quigon was the emperor's servant and was commanded to bring anakin, who was previously discovered by the Sith, to coruscant to be trained as a Jedi, then to be turned by the emperor (once in power) to the dark side to aid in wiping out the jedi.

If Anakin is to appear a Hayden Cristensen, they should re-shoot the death scene with Hayden in make-up to make him look old and scarred.