Stephen Tobolowsky was 23 in Keep My Grave Open when he played the character 'Robert'.
That was over 48 years ago in 1976.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 72, and has starred in 129 movies in total, 127 of those since Keep My Grave Open was released.
In Keep My Grave Open, I think Stephen Tobolowsky looks: