Before Indiana Jones entered director James Mangold’s life, Harrison Ford told him he was worried Indy was looking too old. It was the fall of 2019, and Mangold had joined the team working on the film adaptation of “The Call of the Wild,” in which Ford plays a rugged frontiersman, to help with reshoots. In their downtime, Ford began confiding in Mangold about the fifth “Indiana Jones” movie, which had been bouncing around in development for the better part of three years. Steven Spielberg and screenwriter David Koepp had conceived a roughly five-minute opening sequence set during World War II,...