As Young as You Feel (1951)

Sixty-five-year-old John Hodges must retire from Acme Printing. He later impersonates the president of the parent company and arrives at his old plant on an inspection tour. Acme president McKinley is so nervous not even his beautiful secretary Harriet can calm him. McKinley's wife Lucille becomes infatuated with Hodges. Many further complications ensue.