The thing is, if there was a gf IV, which i would love there to be, the flashback bits about sonny, if they have them, would have to be set when he was making his bones, when he was about 19. this would Tom the same age, with mikey about 15, and fredo in between, connie would be early teens. So this is the kind of ages you're looking at for the cast, obviously you can get away with a little either way. Kay wouldn't be in it. And another thing how can ben affleck play clemenza, he's the same age as the person playing sonny would be, yet he's playing someone a generation older, not to mention that ben affleck is probably younger than bruno Kirkby was in part II, when sonny was only a child.