Charles Durning was 51 in Dog Day Afternoon when he played the character 'Det. Sgt. Eugene Moretti'.
That was over 48 years ago in 1975.
In 2012 he died aged 89, starring in 155 films in his career, 137 of those after Dog Day Afternoon was first released. If he were alive today he would be 100.
In Dog Day Afternoon, I think Charles Durning looks: