André Mouézy-Éon (Writer) · André Berthomieu (Writer)
André Luguet
Thomas Longué
Gaby Morlay
Zabeth Longué
Micheline Dax
Mathilde Billard, Thomas's secretary and lover
Guy Bertil
Jean-Paul Longué, son of Étienne and Armande
Jacques Morel
Étienne Longué, nephew of Thomas
Gisèle Grandpré
Armande Longué, wife of Étienne
Noël Roquevert
Mr. Horville, insurance agent
Claudie Laurence
Sophie
Lisette Lebon
Odile
Mischa Auer
Professor Koranoff
Guy Bedos
Mike, young man who was slapped
Daniel Cauchy
Gérard
Paul Faivre
Abbot
Paul Villé
Dr. Trémière
Andrée Guize
Mrs. Deponchette
Arielle Coigney
Yolande Cola
Jean-Pierre Cassel
Young man at the nightclub (uncredited)
Rivers Cadet
Longués' driver (uncredited)
Jacques Joignant
Young man at the nightclub (uncredited)
Émile Riandreys
Bartender at the nightclub (uncredited)
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Mr. Longué, aged 79, is offered a life annuity on his provincial estate by his nephew. He receives the same, but more advantageous, offer from his insurer, but Mr. Longué has decided to undergo a rejuvenation treatment in Switzerland, at Dr. Koranoff's establishment. The effect was striking, and he was given a new lease on life, leaving his heirs and insurer in complete disarray. His wife, witnessing her husband's metamorphosis, also undergoes the treatment, and off they go on a second honeymoon to Italy.
