When you get to be "my age", you'll get inundated with mailings to join the AARP. They actually start mailing sooner, when you hit 50, I think, sorta like priming the pump.
They offer good discounts on all kinds of stuff, like AAA where you just show your card, and the vendor knocks off 5 or 10%, so I joined 5 or 6 years ago. Then I started getting TWO mailings from them; one at my PO Box where I have 99% of my mail sent, and one to my apartment address. I'd get 'renewal notices' at my apartment address, and invitations to join at my PO Box address. That was exactly the opposite of how my membership was setup; I joined using my PO Box address, and tried to get them to stop the duplicate mailings to my apartment address. I never could get their incompetent "customer service" to understand that I had two addresses, so I canceled my membership.
Then I started reading about them in other publications, and the issues they supported, and decided I was glad to have dropped my membership.
WND has a good article on just how Left Leaning the AARP really is, and gives some insight as to why they're supporting the "Health Care Reform" bill. Makes interesting reading!