Ornella Muti was 14 in The Most Beautiful Wife when she played the character 'Francesca'.
That was over 54 years ago in 1970.
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 106 movies in total, 105 of those since The Most Beautiful Wife was released.
In The Most Beautiful Wife, I think Ornella Muti looks: