R. Lee Ermey was 32 in The Boys in Company C when he played the character 'Sergeant Loyce'.
That was over 46 years ago in 1978.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
In 2018 he died aged 74, starring in 75 films in his career, 74 of those after The Boys in Company C was first released. If he were alive today he would be 80.
In The Boys in Company C, I think R. Lee Ermey looks: