I must say, William Fawcett (1894 - 1974) has always been a favorite of mine. I think it is because the old Saturday morning TV show, "Fury," was one I never missed, and Bill Fawcett was a regular as Pete the ranch hand.
Fawcett worked as an actor from 1936 to 1972, and I believe he always looked like an old man. He was a professor of theater and had a Ph.D., working at Michigan State University before the war. He did appear in one movie in 1936 (The King Steps Out starring Franchot Tone) as a strongman, so maybe he didn't look that old back then.
After WWII, he decided to give acting a try as a full time career, and he went on to appear in almost 250 titles on the big and small screens. I'll try to pick some good examples of his work from each decade.
In the 1940s, Fawcett made eight westerns with Eddie Dean (1907 - 1999). Dean was a singing cowboy who came along a little too late. Dean did manage to make over 50 films, and ended up on "The Beverly Hillbillies."
Fawcett also made two films with Lash La Rue (1917 - 1996), Pioneer Justice and Ghost Town Renegades, both in 1947.
The 1950s brought television. Doc T. (for William Fawcett Thomas) was already working in movie serials, appearing in some Kirk Alyn (1910 - 1999) Superman episodes, and in several others, including Tex Grainger, Pirates of the High Seas, Captain Video and Blackhawk. He started on TV as a regular on "The Range Rider" series around 1952, starring Jock Mahoney (1919 - 1989) and Dickie Jones (b. 1927).
The 1950s were his most prolific years. He could be seen on TV everywhere, from "The Lone Ranger" to "Whirlybirds." Did we really call helicopters 'whirlybirds?' He also appears in No Time for Sergeants (1958) as Andy Griffith's father, and Damn Yankees! (1958) starring Tab Hunter.
1961 brought his only work with John Wayne in The Comancheros. The next year he is uncredited in The Music Man, and he even gets to sing a line in The Wells Fargo Wagon. I just saw him the 1964 Audie Murphy movie, The Quick Gun, but he has a very small part as the bartender. No mistaking that face, though.
Again, the 1960s find him in all sorts of TV shows, from "Perry Mason," Hazel," and "The Smothers Brothers Show." And a few TV series' you may not remember..."T.H.E. Cat" and "Pistols 'n' Petticoats."
Bill Fawcett can be found in Jesse James Meets Frankenstein's Daughter (1966) starring John Lupton (1928 - 1993) and in her last film, Narda Onyx (1931 - 1991).
Fawcett's last movie was The Computer Wore Tennis Shoes (1969) starring Kurt Russell. And after stints on "Bonanza," "Gunsmoke," and "The Virginian," Bill made his final appearance in the TV movie, "The Manhunter" in 1972, starring Sandra Dee (1942 - 2005).
William Fawcett had quite an acting career. He never really was the star of any movies or TV shows, but he added a lot, just by looking old.