Kurtwood Smith was 36 in Murder in Texas when he played the character 'Gus Kalb'.
That was over 43 years ago in 1981.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 80, and has starred in 61 movies in total, 57 of those since Murder in Texas was released.
In Murder in Texas, I think Kurtwood Smith looks: