Shirley Eaton was 15 in Personal Affair when she played the character 'Schoolgirl (uncredited)'.
That was over 71 years ago in 1953.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 87, and has starred in 32 movies in total, 31 of those since Personal Affair was released.
In Personal Affair, I think Shirley Eaton looks: