Home People Mark Harmon Mark Harmon shows Mark Harmon shows Mark Harmon TV Shows (41) All or Nothing: The Michigan Wolverines (2018) As Himself - Narrator, He was 66 years old The Late Late Show with James Corden (2015) As Himself, He was 63 years old NCIS: New Orleans (2014) As NCIS Special Agent Leroy Jethro Gibbs, He was 63 years old The Bonnie Hunt Show (2008) He was 57 years old The Megan Mullally Show (2006) He was 55 years old The Tony Danza Show (2004) He was 53 years old NCIS (2003) As Leroy Jethro Gibbs, He was 52 years old Jimmy Kimmel Live! (2003) He was 51 years old The Legend of Tarzan (2001) He was 50 years old Boston Public (2000) He was 49 years old The West Wing (1999) He was 48 years old From the Earth to the Moon (1998) As Wally Schirra, He was 46 years old The View (1997) He was 45 years old The Rosie O'Donnell Show (1996) He was 44 years old JAG (1995) He was 44 years old Charlie Grace (1995) He was 44 years old Chicago Hope (1994) As Dr. Jack McNeil, He was 43 years old Chicago Hope (1994) He was 43 years old Harts of the West (1993) He was 42 years old The Tonight Show with Jay Leno (1992) He was 40 years old Reasonable Doubts (1991) He was 40 years old Moonlighting (1985) He was 33 years old Moonlighting (1985) As Sam Crawford, He was 33 years old St. Elsewhere (1982) As Dr. Robert Caldwell, He was 31 years old Goliath Awaits (1981) As Peter Cabot, He was 30 years old Flamingo Road (1980) He was 28 years old The Dream Merchants (1980) As Johnny Edge, He was 28 years old 240-Robert (1979) He was 27 years old Centennial (1978) As Captain John McIntosh, He was 27 years old Sam (1978) He was 26 years old The Love Boat (1977) As Doug Bradbury, He was 26 years old The Hardy Boys / Nancy Drew Mysteries (1977) He was 25 years old All's Fair (1976) He was 25 years old Laverne & Shirley (1976) He was 24 years old Saturday Night Live (1975) He was 24 years old Police Woman (1974) He was 23 years old Ozzie's Girls (1973) He was 21 years old Emergency! (1972) He was 20 years old The Bill Cosby Show (1969) He was 18 years old Adam-12 (1968) He was 17 years old Hallmark Hall of Fame (1951) He was 0 years old
