Helen Mirren was 19 in Press for Time when she played the character 'Beauty Pageant Contestant (uncredited)'.
That was over 58 years ago in 1966.
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 148 movies in total, 144 of those since Press for Time was released.
In Press for Time, I think Helen Mirren looks: