"The Old Man and the Key" is the thirteenth episode of the thirteenth season of the American animated television series The Simpsons. It first aired in the United States on the Fox network on March 10, 2002. In the episode, Grampa Simpson falls in love with Zelda, a woman who has just moved into the senior home in which Grampa lives. However, Grampa is not the only one in the home who is infatuated with Zelda.