Today's nerd rage:
One general Star Wars story point that I never liked and the one notion the prequel's introduced that never felt right at all, was the notion that Anakin became Darth Vader almost at the same time that the Galactic Empire was formed.
When I was a kid watching the original films. the Empire seemed massive to me, spanning across so much of the galaxy, that it must have been around for Generations.
Sure, Vader used to be a Jedi before he turned, and then he helped hunt down the Jedi Knights, but my feeling was that in the Old Republic thousands of years before, the Jedi's kept order and honor and peace. When the Empire took over, the Jedi were put down, but some remained, not enough to over-throw the empire - but certainly enough to conjure stories, and to potentially influence people to have faith in the Force. So any kind of Jedi Order was gone, but there were Knights that were possibly working behind the scenes, and those were the ones that Vader hunted down. Possibly the higher ranking people, like the Moff's, never saw the stories of the Knights to be all that credible.
I also always thought that Vader was 40 when he turned, and that his lifespan was increased because he was in a machine. My reason for this was the fact that he was a general and a fighter pilot, and that he would have amassed a great deal of experience on the field and behind the lines.
I never picture him turning while in his 20's/