Passage: Leonardo DiCaprio as Jack Dawson: Cameron said he needed the cast to feel as though they were really on the Titanic, to relive its liveliness, and "to take that energy and give it to Jack, ... an artist who is able to have his heart soar". Jack is portrayed as an itinerant, poor orphan from Chippewa Falls, Wisconsin, who has toured numerous places in the world, including Paris. He wins two tickets onto the RMS Titanic in a poker game and travels as a third-class passenger with his friend Fabrizio. He is attracted to Rose at first sight and meets her when she contemplates throwing herself off the stern of the ship. Her fiancé's "reward", an invitation to dine with them the next evening, enables Jack to mix with the first-class passengers for a night. When casting the role, various established actors, including Matthew McConaughey, Chris O'Donnell, Billy Crudup, and Stephen Dorff, were considered, but Cameron felt that a few of the actors were too old for the part of a 20-year-old. Tom Cruise was interested in portraying the character, but his asking price was too much for the studio to consider. Cameron considered Jared Leto for the role, but Leto refused to audition. Jeremy Sisto auditioned and was filmed in a series of screen tests with Winslet and three other actresses vying for the role of Rose. DiCaprio, 21 years old at the time, was brought to Cameron's attention by casting director Mali Finn. Initially, he did not want to portray the character and refused to read his first romantic scene on the set (see below). Cameron said, "He read it once, then started goofing around, and I could never get him to focus on it again. But for one split second, a shaft of light came down from the heavens and lit up the forest." Cameron strongly believed in DiCaprio's acting ability and told him, "Look, I'm not going to make this guy brooding and neurotic. I'm not going to give him a tic and a limp and all the things you want." Cameron rather envisioned the character as a James Stewart type. Although Jack Dawson was a...

Question: how old was DiCaprio when he was Cameron
21 years old