Research chemist Barnaby Fulton works on a fountain of youth pill for a chemical company. One of the labs chimps gets loose in the laboratory and mixes chemicals, but then pours the mix into the water cooler. When trying one of his own samples, washed down with water from the cooler, Fulton begins to act just like a twenty-year-old and believes his potion is working. Soon his wife and boss are also behaving like children.

Directed by: Howard Hawks
Written by: Howard Hawks & Ben Hecht & Charles Lederer & I. A. L. Diamond
Runtime: 97 minutes
Critics score:
Tagline: It's some fun!
Cast:
Howard Hawks Howard Hawks
Man in Opening (voice) (uncredited) 
Marilyn Monroe Marilyn Monroe
Lois Laurel 
Cary Grant Cary Grant
Barnaby Fulton 
Ginger Rogers Ginger Rogers
Edwina Fulton 
Harry Carey, Jr. Harry Carey, Jr.
Reporter (uncredited) 
Charles Coburn Charles Coburn
Oliver Oxley 
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Also known as:
  • Darling, I'm Growing Younger