Re: Captain America: The Winter Soldier pre-release thread
While I don't think that is the avenue that Marvel would be likely to pursue, there is a twelve year age difference between Robert Redford and Sam Jackson... so perhaps the right application of make-up could make Redford look plausibly old enough to be a Nick Fury Sr.
That's the same gap as between Sean Connery and Harrison Ford. Plus Jackson looks really good for his age.
"What are you going to do?"
"I don't know. I'm making this up as I go."