The First Time I Turned Twenty (original title: La Première fois que j'ai eu 20 ans) is a 2004 French comedy film directed and written by Lorraine Lévy.

Hannah Goldman (Marilou Berry), sixteen and Jewish, has two very pretty sisters and parents who love her.

But she is not happy, feeling herself ugly due to being overweight, and she deeply nourishes a terrible complex at the beauty of her sisters and that of her school friend.

But there have never been any women in the jazz band, established now for many years by the high school music teacher, and in addition, this instrument's position is traditionally held by a man, and for a woman to claim this instrument in training deeply shocks all the high school boys.

But her four musician comrades, viscerally misogynist, very attached to the male tradition of their training, and also singularly lacking all subtlety as any courtesy, will try everything to discourage it.