
Dino, the singing dean of an all‑girls school, teams up with Jerry, a wolf‑like man who dresses as a child and teaches a solitary class of 503 co‑eds. When an aspiring barber is unintentionally caught up in the theft of a valuable diamond, Jerry is forced to masquerade as a twelve‑year‑old, sparking a string of humorous mishaps.
Does You’re Never Too Young have end credit scenes?
No!
You’re Never Too Young does not have end credit scenes. You can leave when the credits roll.
Explore the complete cast of You’re Never Too Young, including both lead and supporting actors. Learn who plays each character, discover their past roles and achievements, and find out what makes this ensemble cast stand out in the world of film and television.

Dean Martin
Bob Miles

Diana Lynn
Nancy Collins

Raymond Burr
Noonan

Hans Conried
Francois

Veda Ann Borg
Mrs. Noonan

Jerry Lewis
Wilbur Hoolick

Nina Foch
Gretchen Brendan

Nancy Kulp
Marty's Mother

Mitzi McCall
Skeets Powell

Milton Frome
Lieutenant O'Malley

Tommy Ivo
Marty

Peggy Moffitt
Agnes (uncredited)

Romo Vincent
Ticket Agent

Whitey Haupt
Michael Brendan

Margery Maude
Mrs. Ella Brendan
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Read the complete plot summary of You’re Never Too Young, including all major events, twists, and the full ending explained in detail. Explore key characters, themes, hidden meanings, and everything you need to understand the story from beginning to end.
A valuable diamond is stolen at a Los Angeles hotel, and the guard is killed. The thief, Noonan, hides the jewel from the police, first in the jacket of a customer, Bob Miles, and then in the pocket of a barber’s apprentice, Wilbur Hoolick. Wilbur, boarding a train to head home to Blitzen, Washington, pretends to be an eleven-year-old in order to snag a half-price ticket, a ruse that sets off a cascade of mistaken identities and comic tension.
Noonan sits beside him, still trying to retrieve the stolen jewel, while Wilbur comes to believe the thief might be a jealous husband. The boyish traveler fatefully hides in the compartment of Nancy Collins, a teacher at a private girls’ school, and Nancy, moved by sympathy for what she thinks is a lonely child, allows him to stay there for the duration of the long train ride. The journey is diverted by a stop-over that changes everything.
During the pause, Gretchen Brendan, the jealous daughter of the school’s headmistress, boards the train and quickly discovers that Nancy is sharing her compartment with a man. Gretchen rushes back to the school to inform Nancy’s fiancé, Bob, of the situation and then attempts to have Nancy dismissed from her post, fearing scandal and damage to reputation. To protect Nancy’s job and reputation, Wilbur must keep up the illusion of being a child, continuing the awkward but affectionate masquerade as “Aunt Nancy” accompanies the all-girl school visit.
The jewel thief pursues them, and the tension escalates as Noonan closes in once again. Amid the peril, Wilbur’s feelings for Nancy deepen, even though she still sees him as a young boy rather than a potential partner. In a dramatic turn, Noonan pretends to be Wilbur’s father and regains possession of the diamond, a move that tightens the stakes and pushes the pursuit toward a climactic confrontation.
The authorities arrive, unleashing a speedboat chase that adds a splash of action to the unfolding farce. In the end, the thief is captured and Wilbur’s true identity is revealed, turning the comic-tragic confusion on its head. Nancy remains fond of Bob, but the story closes with Bob heading off to join the Army, and the surprising revelation that Wilbur is, in fact, the barber who has been tending to Bob all along—an ending that binds romance, deception, and loyalty in one lighthearted package.

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