Catherine Deneuve was 12 in The Twilight Girls when she played the character 'Une petite collégienne'.
That was over 67 years ago in 1957.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 80, and has starred in 187 movies in total, 183 of those since The Twilight Girls was released.
In The Twilight Girls, I think Catherine Deneuve looks: