Final answer:
AARP is a nonprofit organization that advocates for older adults and offers exclusive membership benefits; it is not a government agency.
Step-by-step explanation:
AARP, formerly known as the American Association of Retired Persons, is an influential interest group that focuses on representing and advocating for the interests of individuals who are age fifty and above.
This large organization is not a government agency but rather a nonprofit organization that actively engages in advocacy roles to influence public policy, particularly in areas such as healthcare and social security.
AARP is well-known for its advocacy for older adults and despite sometimes aligning with political parties to get legislation passed, they primarily aim to serve the interests of their members, offering various exclusive membership benefits.