Michael Mann was 52 in Howard Hawks: American Artist when he played the character 'Self'.
That was over 27 years ago in 1997.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 81, and has starred in 14 movies in total, 12 of those since Howard Hawks: American Artist was released.
In Howard Hawks: American Artist, I think Michael Mann looks: