Charlotte Gainsbourg was 12 in Paroles et musique when she played the character 'Charlotte Marker'.
That was over 39 years ago in 1984.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 52, and has starred in 76 movies in total, 70 of those since Paroles et musique was released.
In Paroles et musique, I think Charlotte Gainsbourg looks: