Dr. Heidegger, an old and eccentric physician, calls upon four elderly friends to participate in an experiment. He shows them a rose that he claims is fifty-five years old. He produces a vase, a gift from a friend, that contains a quantity of water. Heidegger explains that this water is from the legendary Fountain of Youth. The water causes the old rose to bloom.
Heidegger's friends become excited and wish to taste the water, hoping it will restore their youth and give them an opportunity to live life free from the mistakes they made when they were younger. As Heidegger watches, they greedily consume the water. Their youth restored, they begin acting as foolishly as youths, and the three men of the group begin competing for the attentions of the lone female member. The transformation does not last, thus reverting them back to their original old age. To obtain more of the magic water, the four test subjects travel to Florida to find the Fountain. Dr. Heidegger remains behind, content in the wisdom of his old age.