Joanne Whalley was 17 in Birth of the Beatles when she played the character 'Schoolgirl (uncredited)'.
That was over 45 years ago in 1979.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 62, and has starred in 48 movies in total, 46 of those since Birth of the Beatles was released.
In Birth of the Beatles, I think Joanne Whalley looks: