Martin Balsam was 33 in On the Waterfront when he played the character 'Gillette (uncredited)'.
That was over 70 years ago in 1954.
In 1996 he died aged 76, starring in 101 films in his career, 99 of those after On the Waterfront was first released. If he were alive today he would be 104.
In On the Waterfront, I think Martin Balsam looks: