Susan Sullivan was 21 in La rivolta dei barbari when she played an uncredited character.
That was over 59 years ago in 1964.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 81, and has starred in 24 movies in total, 24 of those since La rivolta dei barbari was released.
In La rivolta dei barbari, I think Susan Sullivan looks: