I WAS getting junk mail from AARP about two or three times a week. I saved up an entire month’s worth and mailed it back to them with a VERY strongly worded, handwritten letter with LOTS of nasty words like COMMIES, Obozo Lovers, FILTHY PIGS...and take me off your mailing list...
That was about three months ago. Not a single piece of mail from them since..
Great response to AARP!
But, you might consider the round file, thus letting them waste money on mailings. They have been bugging me for 10 years and I ignore the mailings, thinking that passive resistance (in this case) is the most effective.