You're Never Too Young (1955)

You're Never Too Young
Comedy
When an aspiring barber becomes inadvertently involved in the theft of a valuable diamond, necessity forces him to masquerade as a 12 year-old child - with humorous consequences.
Starring
Dean Martin, Jerry Lewis, Diana Lynn, Nina Foch, Raymond Burr, Mitzi McCall, Veda Ann Borg, Margery Maude, Romo Vincent, Nancy Kulp
Directed By
Norman Taurog