Danny Huston was 12 in The Human Factor when he played the character 'Mark Kinsdale (as Danny Houston)'.
That was over 48 years ago in 1975.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 61, and has starred in 76 movies in total, 71 of those since The Human Factor was released.
In The Human Factor, I think Danny Huston looks: