I heard this on TV one time...

[mnaz]

I saw an old man sitting on a park bench, crying. I sat
down next to him and asked him what was the matter. He
wiped his eyes and said, "I'm an old man of eighty-two, and I live
with a beautiful young woman, twenty-four years old. She cooks and
takes care of me, and the sex is unbelievable... six times a day if I
take the blue pills"........ This was perplexing to me, so I asked him why
he was so sad. "I can't remember where I live", came his reply....