If lightning hitting the Emperor deforms him, could that mean that Vader was still looking like Hayden throughout the OT? And his unmasked appearance is a result of getting hit by Palpatine’s lightning? So when Vader decided to thrown him down, he became a Jedi again while still looking young, that’s why Force ghost Hayden makes perfect sense. George, you brilliant writer mastermind.
In that regard, if Mace Windu survived somehow he should definitely look like Morgan Freeman 😉