High Quality Content by WIKIPEDIA articles! "The Old Man and the Key" is the thirteenth episode of The Simpsons` thirteenth season. 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, an old woman who has just moved in to the senior home in which Grampa lives. However, Grampa is not the only one in the home who is infatuated with Zelda.