Principal photography for “Titanic” began in September 1996, according to the Democrat & Chronicle. This means that Leonardo DiCaprio was just two months away from his 22nd birthday when the filming began for the role that made him a star. DiCaprio turned 23 in December 1997 when the film was released. Kate Winslet, who was 20 at the start of filming, turned 21 one month later.
While promoting “Titanic 3-D” on iTV’s “Daybreak” in 2012 (via Us Magazine), Winslet confirmed that’s how old they were, using the opportunity to tease her former co-star and friend about his changed looks. “We do look very different, we’re older. Leo’s 37, I’m 36 — we were 21 and 22 when we made that film. You know, he’s fatter now — I’m thinner,” She made a joke. The young actors were tasked with bringing to life what was set to become the highest-grossing film of all time, according to Variety, and win a record-breaking number of Oscars, according to the Guinness World Records.
Winslet and DiCaprio needed to team up in order for them to accomplish this extraordinary feat. “Kate and I are … so close on this film. We’re like partners,” DiCaprio told E! News at the time. They are still close friends. “Our chemistry and our friendship was so profound. … We were very, very lucky that we did just click and got on so well all of the time,” Winslet said.