AARP website cleary indicates that you have to be 50. So, I just now tried to join - with a fake name, fake address, and fake year of birth (2000). They flagged the address - so I put in a real address (not mine). Age didn't get flagged. took me to a billing page. Obviously I'm not going to give billing information (real or fake) so I don't know at what point in the process the age would get flagged, if ever.
I'm not disputing you that you have to be 50 to join. Just noting that they seem to have some major flaws in their system for tracking people, and as they get money from people who pay it to them, have an incentive to not look too closely.
