David Duchovny, who portrayed the determined Mulder, was 33 when he first took on the role. Today, at 64, Duchovny continues to thrive in a diverse acting career, appearing in various film and television projects. Gillian Anderson, who played the skeptical Scully, was just 25 during her debut. Now 56, Anderson has built an impressive career across different genres, earning acclaim for her roles in “The Fall” and “American Gods.”