But as far as adapting "The Family Corleone," Sonny is only 17 years old in the book, Scott Caan is almost 36. He's actually older now than his father was when he played Sonny (James Caan was 31 while filming in 1971).
And your point being?

With today's technology in hollywood....
Seriously though, I was not suggesting using Scott Caan if a movie was to be made. I merely was pointing out that in my mind's eye I just pictured a young Scott Caan as Sonny while reading.