Jacqueline Bisset was 19 in The Knack... and How to Get It when she played the character 'Extra (uncredited)'.
That was over 59 years ago in 1965.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 79, and has starred in 111 movies in total, 109 of those since The Knack... and How to Get It was released.
In The Knack... and How to Get It, I think Jacqueline Bisset looks: