AARP Inc., formerly called the American Association of Retired Persons, is the largest membership club for retired people in the United States. Some similar alternatives that operate on a smaller scale nationally include The Seniors Coalition, the 60 Plus Association and the Association of Mature American Citizens.
AARP was founded in 1958 as an advocacy group for retired Americans. Being retired is not a requirement for membership, however. Members only need to be age 50 or older and a citizen of the United States. The group's advocacy efforts are now more broadly focused on older Americans, with less of a focus on retirement issues. Members also enjoy a wide variety of discounts on various goods and services. With an estimated membership of over 37 million, AARP is easily the largest retirement club in the nation.
Some smaller alternatives exist and have memberships in the millions, however. In addition to the examples already listed, there is also the American Seniors Association and The National Association of Conservative Seniors. These organizations largely sprung up in response to a view among politically and socially conservative seniors that AARP leaned too far to the left on certain issues, such as its support for health care reform.