Simonetta Stefanelli was 12 in La moglie giapponese when she played an uncredited character.
That was over 56 years ago in 1968.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 69, and has starred in 19 movies in total, 18 of those since La moglie giapponese was released.
In La moglie giapponese, I think Simonetta Stefanelli looks: