Sophie Marceau was 13 in The Party when she played the character 'Vic Berreton'.
That was over 43 years ago in 1980.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 57, and has starred in 58 movies in total, 57 of those since The Party was released.
In The Party, I think Sophie Marceau looks: