I thought I already told this joke here, musta been in a prior year.

So the docter tells the geriatric patient, I've got good news and bad news. Let's hear the good news first, says the patient. OK - you have AIDS. That's the good news? cries the patient. What is worse than that? Well, says the doctor, you have Alzheiner's. Oh, says the patient, well, at least I don't have AIDS.