How old was Mark Harmon in…

Mark Harmon

Bio: Thomas Mark Harmon (born September 2, 1951) is an American actor, producer and director. He is known for playing the lead role of Leroy Jethro Gibbs on NCIS (2003-2021), a role which has earned him six nominations at the People's Choice Awards including a win for Favorite TV Crime Drama Actor in 2017

Born: Sun, Sep 02 1951

Birthplace: Burbank, California, USA

Mark Harmon is 73 years old

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Acting Roles

Crew Roles

Movies (Acting Roles)

Sorted by Release Date

Freakier Friday

Mark Harmon will be

73 in Freakier Friday

as 'Ryan'.

Thu, Aug 07 2025

NCISverse: The First 1,000

Mark Harmon was

72 in NCISverse: The First 1,000

as 'Self'.

Mon, Apr 08 2024

The Wild

Mark Harmon was

67 in The Wild

as 'Self'.

Sun, May 19 2019

Certain Prey

Mark Harmon was

60 in Certain Prey

as 'Lucas Davenport'.

Sun, Nov 06 2011

Justice League: Crisis on Two Earths

Mark Harmon was

58 in Justice League: Crisis on Two Earths

as 'Clark Kent / Superman (voice)'.

Tue, Feb 23 2010

Weather Girl

Mark Harmon was

57 in Weather Girl

as 'Dale'.

Fri, Jul 10 2009

Chasing Liberty

Mark Harmon was

52 in Chasing Liberty

as 'James Foster'.

Fri, Jan 09 2004

Freaky Friday

Mark Harmon was

51 in Freaky Friday

as 'Ryan'.

Tue, Aug 05 2003

Local Boys

Mark Harmon was

50 in Local Boys

as 'Jim Wesley'.

Sat, Feb 23 2002

Intimate Portrait: Pam Dawber

Mark Harmon was

50 in Intimate Portrait: Pam Dawber

as 'Self'.

Tue, Jan 01 2002

I'll Remember April

Mark Harmon was

49 in I'll Remember April

as 'John Cooper'.

Thu, Apr 05 2001

And Never Let Her Go

Mark Harmon was

49 in And Never Let Her Go

as 'Thomas Capano'.

Sun, Apr 01 2001

Crossfire Trail

Mark Harmon was

49 in Crossfire Trail

as 'Bruce Barkow'.

Sun, Jan 21 2001

The Amati Girls

Mark Harmon was

49 in The Amati Girls

as 'Lawrence'.

Tue, Jan 09 2001

For All Time

Mark Harmon was

49 in For All Time

as 'Charles Lattimer'.

Wed, Oct 18 2000

Fear and Loathing in Las Vegas

Mark Harmon was

46 in Fear and Loathing in Las Vegas

as 'Magazine Reporter'.

Tue, May 19 1998

Casualties

Mark Harmon was

45 in Casualties

as 'Tommy Nance'.

Tue, Apr 15 1997

The First to Go

Mark Harmon was

45 in The First to Go

as 'Jeremy Hampton'.

Wed, Jan 01 1997

The Last Supper

Mark Harmon was

44 in The Last Supper

as 'Dominant Male'.

Fri, Sep 08 1995

Magic in the Water

Mark Harmon was

43 in Magic in the Water

as 'Jack Black'.

Wed, Aug 30 1995

Original Sins

Mark Harmon was

43 in Original Sins

as 'Johnathan Franye'.

Wed, Apr 12 1995

Natural Born Killers

Mark Harmon was

42 in Natural Born Killers

as 'Mickey Knox in TV'.

Fri, Aug 26 1994

Wyatt Earp

Mark Harmon was

42 in Wyatt Earp

as 'Sheriff Johnny Behan'.

Fri, Jun 24 1994

Cold Heaven

Mark Harmon was

40 in Cold Heaven

as 'Alex Davenport'.

Fri, May 29 1992

Till There Was You

Mark Harmon was

39 in Till There Was You

as 'Frank Flynn'.

Thu, Jul 18 1991

Shadow of a Doubt

Mark Harmon was

39 in Shadow of a Doubt

as 'Charles Spencer'.

Sat, Apr 27 1991

Long Road Home

Mark Harmon was

39 in Long Road Home

as 'Ertie Robertson'.

Mon, Feb 25 1991

Fourth Story

Mark Harmon was

39 in Fourth Story

as 'David Shepard'.

Sat, Jan 19 1991

Dillinger

Mark Harmon was

39 in Dillinger

as 'John Dillinger'.

Sun, Jan 06 1991

Worth Winning

Mark Harmon was

38 in Worth Winning

as 'Taylor Worth'.

Fri, Oct 27 1989

Sweet Bird of Youth

Mark Harmon was

38 in Sweet Bird of Youth

as 'Chance Wayne'.

Sun, Oct 01 1989

Stealing Home

Mark Harmon was

36 in Stealing Home

as 'Billy Wyatt'.

Fri, Aug 26 1988

The Presidio

Mark Harmon was

36 in The Presidio

as 'Jay Austin'.

Fri, Jun 10 1988

After the Promise

Mark Harmon was

36 in After the Promise

as 'Elmer Jackson'.

Sun, Oct 11 1987

Dear America: Letters Home from Vietnam

Mark Harmon was

36 in Dear America: Letters Home from Vietnam

as '(voice)'.

Thu, Oct 01 1987

Summer School

Mark Harmon was

35 in Summer School

as 'Mr. Freddy Shoop'.

Wed, Jul 22 1987

Let's Get Harry

Mark Harmon was

35 in Let's Get Harry

as 'Harry'.

Fri, Oct 31 1986

The Deliberate Stranger

Mark Harmon was

34 in The Deliberate Stranger

as 'Ted Bundy'.

Sun, May 04 1986

Prince of Bel Air

Mark Harmon was

34 in Prince of Bel Air

as 'Robin Prince'.

Mon, Jan 20 1986

Tuareg: Desert Warrior

Mark Harmon was

32 in Tuareg: Desert Warrior

as 'Gacel Sayah'.

Mon, Mar 12 1984

Intimate Agony

Mark Harmon was

31 in Intimate Agony

as 'Tommy'.

Mon, Mar 21 1983

Flamingo Road

Mark Harmon was

28 in Flamingo Road

as 'Fielding Carlyle'.

Mon, May 12 1980

Beyond the Poseidon Adventure

Mark Harmon was

27 in Beyond the Poseidon Adventure

as 'Larry Simpson'.

Fri, May 18 1979

Comes a Horseman

Mark Harmon was

27 in Comes a Horseman

as 'Billy Joe Meynert'.

Wed, Oct 25 1978

Little Mo

Mark Harmon was

27 in Little Mo

as 'Norman Brinker'.

Tue, Sep 05 1978

Getting Married

Mark Harmon was

26 in Getting Married

as 'Howie Lesser'.

Wed, May 17 1978

Eleanor and Franklin: The White House Years

Mark Harmon was

25 in Eleanor and Franklin: The White House Years

as 'Robert Dunlap'.

Sun, Mar 13 1977

Sonic Boom

Mark Harmon was

22 in Sonic Boom

as 'Student Controller'.

Tue, Jan 01 1974

TV Shows (Acting Roles)

Sorted by Release Date
Ages in TV shows are based off the first air date and may not be accurate. View individual episode details for accurate ages

NCIS: Origins

Mark Harmon was

73+ in NCIS: Origins

as 'Older Leroy Jethro Gibbs (uncredited), Older Leroy Jethro Gibbs (voice) (uncredited)'.

First Air Date
Mon, Oct 14 2024

Joe Montana: Cool Under Pressure

Mark Harmon was

70+ in Joe Montana: Cool Under Pressure

as 'Narrator (voice)'.

First Air Date
Thu, Jan 06 2022

The Kelly Clarkson Show

Mark Harmon was

68+ in The Kelly Clarkson Show

as 'Self'.

First Air Date
Mon, Sep 09 2019

All or Nothing: The Michigan Wolverines

Mark Harmon was

66+ in All or Nothing: The Michigan Wolverines

as 'Narrator (voice)'.

First Air Date
Fri, Apr 06 2018

The American West

Mark Harmon was

64+ in The American West

as 'Self'.

First Air Date
Sat, Jun 11 2016

The Late Late Show with James Corden

Mark Harmon was

63+ in The Late Late Show with James Corden

as 'Self'.

First Air Date
Mon, Mar 23 2015

NCIS: New Orleans

Mark Harmon was

63+ in NCIS: New Orleans

as 'Leroy Jethro Gibbs'.

First Air Date
Tue, Sep 23 2014

The Arsenio Hall Show

Mark Harmon was

62+ in The Arsenio Hall Show

as 'Self'.

First Air Date
Mon, Sep 09 2013

The Bonnie Hunt Show

Mark Harmon was

57+ in The Bonnie Hunt Show

First Air Date
Mon, Sep 08 2008

The Megan Mullally Show

Mark Harmon was

55+ in The Megan Mullally Show

as 'Self - Guest'.

First Air Date
Mon, Sep 18 2006

The Tony Danza Show

Mark Harmon was

53+ in The Tony Danza Show

as 'Self'.

First Air Date
Mon, Sep 13 2004

NCIS

Mark Harmon was

52+ in NCIS

as 'Leroy Jethro Gibbs'.

First Air Date
Tue, Sep 23 2003

Jimmy Kimmel Live!

Mark Harmon was

51+ in Jimmy Kimmel Live!

First Air Date
Sun, Jan 26 2003

The Legend of Tarzan

Mark Harmon was

50+ in The Legend of Tarzan

as 'Bob Markham (voice)'.

First Air Date
Mon, Sep 03 2001

And Never Let Her Go

Mark Harmon was

49+ in And Never Let Her Go

as 'Thomas Capano'.

First Air Date
Sun, Apr 01 2001

The West Wing

Mark Harmon was

48+ in The West Wing

as 'Simon Donovan'.

First Air Date
Wed, Sep 22 1999

Family Guy

Mark Harmon was

47+ in Family Guy

as 'Leroy Jethro Gibbs (voice)'.

First Air Date
Sun, Jan 31 1999

From the Earth to the Moon

Mark Harmon was

46+ in From the Earth to the Moon

as 'Wally Schirra'.

First Air Date
Sun, Apr 05 1998

The View

Mark Harmon was

45+ in The View

as 'Self'.

First Air Date
Mon, Aug 11 1997

The Rosie O'Donnell Show

Mark Harmon was

44+ in The Rosie O'Donnell Show

as 'Self'.

First Air Date
Mon, Jun 10 1996

JAG

Mark Harmon was

44+ in JAG

as 'Leroy Jethro Gibbs'.

First Air Date
Sat, Sep 23 1995

Charlie Grace

Mark Harmon was

44+ in Charlie Grace

as 'Charlie Grace'.

First Air Date
Thu, Sep 14 1995

Chicago Hope

Mark Harmon was

43+ in Chicago Hope

as 'Jack McNeil'.

First Air Date
Sun, Sep 18 1994

Harts of the West

Mark Harmon was

42+ in Harts of the West

First Air Date
Sat, Sep 25 1993

The Tonight Show with Jay Leno

Mark Harmon was

40+ in The Tonight Show with Jay Leno

First Air Date
Mon, May 25 1992

Reasonable Doubts

Mark Harmon was

40+ in Reasonable Doubts

as 'Det. Dicky Cobb'.

First Air Date
Thu, Sep 26 1991

Moonlighting

Mark Harmon was

33+ in Moonlighting

as 'Sam Crawford'.

First Air Date
Sun, Mar 03 1985

St. Elsewhere

Mark Harmon was

31+ in St. Elsewhere

as 'Robert Caldwell'.

First Air Date
Tue, Oct 26 1982

Goliath Awaits

Mark Harmon was

30+ in Goliath Awaits

as 'Peter Cabot'.

First Air Date
Wed, Nov 11 1981

Entertainment Tonight

Mark Harmon was

30+ in Entertainment Tonight

as 'Self'.

First Air Date
Tue, Sep 15 1981

Flamingo Road

Mark Harmon was

29+ in Flamingo Road

First Air Date
Tue, Jan 06 1981

The Dream Merchants

Mark Harmon was

28+ in The Dream Merchants

as 'Johnny Edge'.

First Air Date
Mon, May 12 1980

240-Robert

Mark Harmon was

27+ in 240-Robert

as 'Thib Thibideaux'.

First Air Date
Tue, Aug 28 1979

Centennial

Mark Harmon was

27+ in Centennial

as 'Captain John McIntosh'.

First Air Date
Sun, Oct 01 1978

Sam

Mark Harmon was

26+ in Sam

as 'Mike Breen'.

First Air Date
Tue, Mar 14 1978

The Love Boat

Mark Harmon was

26+ in The Love Boat

as 'Doug Bradbury'.

First Air Date
Sat, Sep 24 1977

The Hardy Boys / Nancy Drew Mysteries

Mark Harmon was

25+ in The Hardy Boys / Nancy Drew Mysteries

First Air Date
Sun, Jan 30 1977

All's Fair

Mark Harmon was

25+ in All's Fair

First Air Date
Mon, Sep 20 1976

Delvecchio

Mark Harmon was

25+ in Delvecchio

as 'Ronnie Striker'.

First Air Date
Thu, Sep 09 1976

Laverne & Shirley

Mark Harmon was

24+ in Laverne & Shirley

First Air Date
Tue, Jan 27 1976

Saturday Night Live

Mark Harmon was

24+ in Saturday Night Live

as 'Self - Host'.

First Air Date
Sat, Oct 11 1975

Police Woman

Mark Harmon was

23+ in Police Woman

as ', Stanski'.

First Air Date
Fri, Sep 13 1974

Ozzie's Girls

Mark Harmon was

22+ in Ozzie's Girls

First Air Date
Sat, Sep 15 1973

Emergency!

Mark Harmon was

20+ in Emergency!

First Air Date
Sat, Jan 22 1972

Adam-12

Mark Harmon was

17+ in Adam-12

as 'Officer Gus Corbin'.

First Air Date
Sat, Sep 21 1968

The Tonight Show Starring Johnny Carson

Mark Harmon was

11+ in The Tonight Show Starring Johnny Carson

as 'Self'.

First Air Date
Mon, Oct 01 1962

Hallmark Hall of Fame

Mark Harmon was

0+ in Hallmark Hall of Fame

as 'Charles'.

First Air Date
Mon, Dec 24 1951

Golden Globe Awards

Mark Harmon was

0+ in Golden Globe Awards

as 'Self - Nominee, Self'.

First Air Date
Thu, Jan 20 1944