AARP?!?

Yesterday I received an invitation in the mail to join AARP. WHAT?!? I believe you have to be at least 50 years old to join AARP. I do have a birthday in 3 weeks, but I will be turning 36 not 50! The name listed was my maiden name; the next time we move I plan on only listing my married name in terms of mail to be forwarded so anything that comes with my maiden name now I won't receive. I was waiting on one check with my maiden name when we moved here (even though we had been married 3 years at that point). Maybe it was AARP playing an April Fools joke on me a day early? I can't wait for the u/s tomorrow morning!!!