Forty-Six
We have had previous posts of opinions on GF 4 and many, including myself would love to see GF4 centered on a middleaged Vito and young Santino, showing exactly how he came into power and how Santino, Fredo, Michael grew up.
Actually, I would be happy if GF Four started right after Vito kills Don Fanucci. How did he become the "DON". We only got small taste of the "beginning". I think they could get a "young" actor to play Vito in his 20's/30's and then it's DeNiro for the remainder. Oh well, we can dream!!!