Elias Koteas was 18 in Atlantic City when he played the character 'Extra (uncredited)'.
That was over 43 years ago in 1980.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 62, and has starred in 79 movies in total, 76 of those since Atlantic City was released.
In Atlantic City, I think Elias Koteas looks: