AARP is a United States–based interest group focusing on issues affecting those over the age of fifty. According to the organization, it had more than 38 million members as of 2018. The magazine and bulletin it sends to its members are the two largest-circulation publications in the United States. AARP was founded in 1958 by Ethel Percy Andrus and Leonard Davis. It is an influential lobbying group in the United States. AARP sells paid memberships, and markets insurance and other services to its members.