R. Lee Ermey was 42 in Full Metal Jacket when he played the character 'Gny. Sgt. Hartman'.
That was over 37 years ago in 1987.
In 2018 he died aged 74, starring in 75 films in his career, 71 of those after Full Metal Jacket was first released. If he were alive today he would be 80.
In Full Metal Jacket, I think R. Lee Ermey looks: