Brian Dennehy was 37 in Johnny, We Hardly Knew Ye when he played the character 'Longshoreman'.
That was over 46 years ago in 1977.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
In 2020 he died aged 81, starring in 133 films in his career, 132 of those after Johnny, We Hardly Knew Ye was first released. If he were alive today he would be 84.
In Johnny, We Hardly Knew Ye, I think Brian Dennehy looks: