He never ever looked young
He was born like Benjimen Button, except he never grew young.
Google image search him with the word "young", the youngest he ever looked was late 30s, and that's when he was a senior in high school.
Hey Intothenightalone,
Respectfully, I would tend to disagree with you about Duvall always looking old. I would suggest his early balding is the main factor for thinking of Duvall as looking older than his true age. I have a nephew who, like Duvall, was completely bald on the top of his head by his late 20s, and this did make him look older than his classmates who did have full heads of hair. Put a toupee on my nephew or Duvall, and they instantly look younger.
Duvall appeared in dozens of TV shows before his 1962 performance as Boo Radley in To Kill A Mockingbird. Whenever he wore a toupee, he looked his age. He was in three episodes of Combat! between 1965 and 1967. In each of these roles, he wore a toupee, and he certainly did not look older than his true age of his mid 30s. In 1968 he appeared in The Detective with very little hair on the top of his head, and he certainly looked much older than he did a year earlier when he was on Combat!.
In 1976 at about 45 years of age, Duvall played the German Colonel Radl in The Eagle Has Landed, and he still looked young to me. He did not have a chicken neck, and his face was lined as it would become in another ten years. In his performance as Lt. Col. 'Bull' Meechum in The Ace, he still looked the correct age for a WW2 vet, and he was about 48 years of age at the time. When he did Tender Mercies just a few years later, he did it with his few strands of hair, and he certainly did look a lot older than his earlier work.
Does Robert Duvall look old now? Sure he does, but he is now in his mid 80s, and I still enjoy his work.
Best wishes,
Dave Wile