Jean-Claude Van Damme was 17 in Woman Between Wolf and Dog when he played the character 'Movie Goer / Man in Garden (uncredited)'.
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).
Today he is 63, and has starred in 83 movies in total, 81 of those since Woman Between Wolf and Dog was released.
In Woman Between Wolf and Dog, I think Jean-Claude Van Damme looks: