Fred Gwynne was 59 in The Secret of My Success when he played the character 'Donald Davenport'.
That was over 37 years ago in 1987.
In 1993 he died aged 67, starring in 38 films in his career, 12 of those after The Secret of My Success was first released. If he were alive today he would be 97.
In The Secret of My Success, I think Fred Gwynne looks: