John and Mabel were a regular item at the retirement village. As far as sex was concerned however, all Mabel ever did was gently hold his penis.
As time passed Mabel noticed that he came to see her less often, and spent more time with Amy.
Eventually she couldn't stand it any more and decided to confront him.
"What has Amy got that I haven't?" she asked.
"Parkinson's," he replied.
