Jaclyn Smith was 22 in Goodbye, Columbus when she played the character 'Wedding Guest (uncredited)'.
That was over 55 years ago in 1969.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 78, and has starred in 37 movies in total, 38 of those since Goodbye, Columbus was released.
In Goodbye, Columbus, I think Jaclyn Smith looks: