The American Association of Retired Persons (AARP) appeared in the Season Seven episode, "Grey Dawn". The group is a non-profit organization that lobbies the United States government on behalf of elderly and retired citizens.
The townsfolk of South Park vote to have the driver's licenses of the elderly revoked, due to the many accidents they cause. In response to this, Marvin Marsh leads the other tenants of the Shady Acres retirement home in a militant protest.
The AARP soon later captures the town, holds the younger townsfolk hostage, and makes unfair demands in their favor. Before their threats are allowed to be carried out, the elderly are defeated when their food supply is cut off at the Country Kitchen Buffet.