Aging roué Arthur Merrill meets flapper Penelope Stevens on an ocean liner and decides to undergo rejuvenation surgery so that he may enjoy life again. Transformed, he attends a wild jazz party given by Penelope and persuades her to visit his apartment, but he finds that she is a "good girl" and only flirting. After he gives Penelope a scare and a lecture, her old beau, Brock Farley, enters with a letter to Arthur that reveals Brock to be his son. Arthur gladly steps aside, renounces his wild living, and returns to a simple life.