Michael Douglas was 20 in Cast a Giant Shadow when he played the character 'Jeep Driver (uncredited)'.
That was over 58 years ago in 1966.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 79, and has starred in 98 movies in total, 97 of those since Cast a Giant Shadow was released.
In Cast a Giant Shadow, I think Michael Douglas looks: