| He played Lt. Gerard on "The Fugitive" | 48 |
| He played Mandela on TV's "Mandela" | 49 |
| He played Marsellus in "Pulp Fiction" | 47 |
| He played Marty in "Marty" | 36 |
| He played Mary Richards's boss | 34 |
| He played Max on "MASH" | 33 |
| He played Maximus Decimus Meridius | 34 |
| He played Mingo on "Daniel Boone" | 43 |
| He played Mowgli in 'Jungle Book' | 41 |
| He played Mowgli in "Jungle Book" | 43 |
| He played Mr. Magoo in "Mr. Magoo" | 44 |
| He played Neo in "The Matrix" | 39 |
| He played Nero in 'Quo Vadis' | 37 |
| He played Nick to Barbra's Fanny | 36 |
| He played Nixon in "Nixon" | 36 |
| He played officer Poncherello on TV | 35 |
| He played one of TV's Sopranos | 34 |
| He played opposite Burton in "Becket" | 47 |
| He played Paul Drake on 'Perry Mason' | 45 |
| He played Pickering in "My Fair Lady" | 47 |
| He played Pierce on "MASH" | 36 |
| He played Pinky in "Duck Soup" | 40 |
| He played Ponch on ''CHiPs'' | 44 |
| He played Ponch on "CHiPs" | 36 |
| He played Quint in "Jaws" | 35 |
| He played Rob in ''Rob Roy'' | 44 |
| He played Roger in "Airplane!" | 40 |
| He played Rowdy in TV's "Rawhide" | 47 |
| He played Sam on "Cheers" | 35 |
| He played Santa in "Elf" | 34 |
| He played Sheldon in "Misery" | 39 |
| He played Sigler's brother on TV | 36 |
| He played Sinatra in "The Rat Pack" | 45 |
| He played Sonny in "The Godfather" | 44 |
| He played Sparrow and Scissorhands | 34 |
| He played Sulu on "Star Trek" | 39 |
| He played Tessio in "The Godfather" | 45 |
| He played The Chief in "Dirty Harry" | 46 |
| He played the Hulk on 1970s-'80s TV | 39 |
| He played the lyre, not the fiddle | 34 |
| He played the mark in "The Sting" | 43 |
| He played the same character for 20 years | 41 |
| He played the Thing in "The Thing" | 44 |
| He played Tommy in "Tommy" | 36 |
| He played Tony on "NYPD Blue" | 39 |
| He played Ugarte in "Casablanca'' | 46 |
| He played Ugarte in "Casablanca" | 42 |
| He played Uncle Bill on "Family Affair" | 49 |
| He played Van Doren in "Quiz Show" | 44 |
| He played Vito in "The Godfather" | 43 |
| He played Wesley Crusher on "ST: TNG" | 47 |
| He played Wesley on "Star Trek: T.N.G." | 49 |
| He played Winchester on "MASH" | 40 |
| He played Yemana on "Barney Miller" | 45 |
| He played Yogurt in "Spaceballs" | 42 |
| He played Yuri in "Doctor Zhivago" | 44 |
| He played Yuri to Julie's Lara | 34 |
| He plays Andy Bernard on "The Office" | 47 |
| He plays Dr. Carter on "ER" | 37 |
| He plays Dr. Eric Foreman on "House" | 46 |
| He plays Dr. Foreman on "House" | 41 |
| He plays Dr. Jack Shephard on "Lost" | 46 |
| He plays Fin on "Law & Order: SVU" | 48 |
| He plays Jack Donaghy on "30 Rock" | 44 |
| He plays Jack on "30 Rock" | 36 |
| He plays Lord Voldemort in Harry Potter films | 45 |
| He plays Matt Houston's uncle | 33 |
| He plays Sam in "Transformers" | 40 |
| He plays Sam on "Private Practice" | 44 |
| He plays the Priceline Negotiator | 33 |
| He plays Tom on "Parks and Recreation" | 48 |
| He plays with an edge and with The Edge | 39 |
| He portrayed Ray in "Ray" | 35 |
| He portrayed the original Obi-Wan | 33 |
| He pours beers for Homer, Carl and Lenny | 40 |
| He preceded and followed O'Brien | 36 |
| He preceded Michael in the morning | 34 |
| He predated Johnny Depp as Willy Wonka | 38 |
| He prepared eggs for the Romanovs | 33 |
| He proclaimed "I shook up the world" | 46 |
| He produced "Good Times" | 34 |
| He produced "We Are the World" | 40 |
| He prophesied the destruction of Jerusalem | 42 |
| He provided the voice for Disney's Mad Hatter | 49 |
| He put on a show for hockey fans | 32 |
| He put the "O" in Jackie O | 36 |
| He raised quite a racket in the 60's | 40 |
| He ran a Mickey Mouse operation for 21 years | 44 |
| He ran against Bill and Bob in 1996 | 35 |
| He ran against Bill and George in 1992 | 38 |
| He reached the South Pole in January 1912 | 41 |
| He really, really wasn't born in Kenya, yeesh | 49 |
| He recorded "Mack the Knife" | 38 |
| He released "The New Frontier" in 1961 | 48 |
| He released the album "So" | 36 |
| He replaced Gumbel on "Today" | 39 |
| He replaced Jay, then Jay replaced him | 38 |
| He reprised Michael's "Alfie" role | 48 |
| He requested that his ashes leave Earth | 39 |
| He returned to the airwaves on 12/3/07 | 38 |