The first crusades ended in 1271 & lingered until 1291, so likely he was not involved. His father may have been. This is the first I have seen of his date of death and a son named Jean. Roberto was the only son from what I had found so far.
As far as being a father at the age of 50, my dad, Joe Lefebvre, was the father of my youngest brother at the age of 53.