All Gummed Up (1947)

The Stooges are owners of the Cut Throat Drug Store, but their crabby old landlord Amos Flint wants them out after 10 years after making a better deal with the Pinch Penny Market. Flint's wife shows up while he's telling the Stooges, and he dumps her because she's gotten old. The boys take her in, and Shemp gets the brilliant idea to invent a Fountain of Youth to make old people young again. Beyond all expectations they actually succeed, turning Mrs. Flint back into a gorgeous young woman!