John Cazale was 38 in Dog Day Afternoon when he played the character 'Sal'.
That was over 49 years ago in 1975.
In 1978 he died aged just 42, starring in 10 films in his career, 5 of those after Dog Day Afternoon was first released. If he were alive today he would be 88.
In Dog Day Afternoon, I think John Cazale looks: