Mark Harmon has been a staple of NCIS since the show’s debut in 2003, playing the tough yet compassionate Special Agent Leroy Jethro Gibbs. But over 21 years on the show, the 72-year-old actor has undergone a noticeable transformation. Fans who first saw him in his younger days are now witnessing a more mature, experienced version of the actor, a shift that comes with the passage of time.

While Gibbs has always been known for his rugged demeanor, Harmon’s appearance has evolved, reflecting his age and the natural process of aging in Hollywood. His graying hair, more defined wrinkles, and slightly altered features show the years of dedication to his craft. Despite these changes, Harmon still carries the same presence and authority that made him a beloved character on NCIS.

This transformation isn’t just about physical appearance—it’s also about the depth and maturity Harmon has brought to his role over the years. His portrayal of Gibbs has grown more nuanced, with the character navigating a variety of personal losses and challenges. Harmon’s experience both on and off-screen has allowed him to deliver even more powerful performances, making his character feel as vital as ever to the NCIS team.

After more than two decades in the role, Harmon’s departure from the show marked the end of an era, but his impact on NCIS remains undeniable. Whether onscreen or off, Mark Harmon’s legacy continues to be a key part of the franchise’s success.