Michael Jeter was 25 in Hair when he played the character 'Sheldon'.
That was over 45 years ago in 1979.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
In 2003 he died aged just 50, starring in 44 films in his career, 43 of those after Hair was first released. If he were alive today he would be 71.
In Hair, I think Michael Jeter looks: