I used to belong - as with many, for the discounts (and they are GOOD if you're traveling), but I sh*tcanned 'em years ago.....but I keep the card in my wallet.
If anybody even asks to see it when I inquire -- which is exceedingly rare -- I flash the long expired card and still get the goods. Ain't been busted yet.
My 23 year old child is constantly peppered with AARP membership junk mail.