Mia Farrow was 16 in The Age of Curiosity when she played an uncredited character.
That was over 61 years ago in 1963.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 79, and has starred in 66 movies in total, 65 of those since The Age of Curiosity was released.
In The Age of Curiosity, I think Mia Farrow looks: