James Van Der Beek has marked his eldest daughter's 15th birthday with a poignant post. Taking to Instagram on Thursday, September 25, Van Der Beek reflected that his daughter Olivia is now the age his character was when he began his most iconic role on Dawson's Creek. "My oldest turned 15 today," Van Der Beek, 48, wrote. "Same age that Dawson was in the pilot." Alongside the lengthy caption, the Varsity Blues star shared a video of Olivia on stage at the recent Dawson's Creek reunion, where she performed the show's theme song, Paula Cole's "I Don't Want to Wait.