You think that is bad vaderisnot hayden how about how Old Obi wan is in what is now called Episode IV vs how old he is in revenge of the Sith.
I mean Obi would be what only in his fifties and Alec Guiness looks nowhere near in his fifties.
I guess Lucas just hoped people would not notice the twenty year mistake he made in star wars revision in the prequels. as it is to remain consistant he would have to do a lot more than just add a few more scenes to the original trilogy it has to be completely rewritten and reshot,lol. All of this could have been ovoided if he only followed the original outline he wrote in the 70's and probably revised all the way up until return of the jedi.