Martin Balsam was 55 in All the President's Men when he played the character 'Howard Simons'.
That was over 48 years ago in 1976.
In 1996 he died aged 76, starring in 101 films in his career, 46 of those after All the President's Men was first released. If he were alive today he would be 104.
In All the President's Men, I think Martin Balsam looks: