Three mischievous old women were sitting on a bench outside a nursing home in suburban Philadelphia when an older gentleman walked by.
One of the women called out to him: "We bet we can tell exactly how old you are."
The old man answered her, "There's no way you can guess it, you old fools."
One of the other women answered, "Sure we can! Just drop your pants and under shorts, and we can tell your exact age."
Embarrassed just a little but anxious to prove they couldn’t do it, he dropped his drawers.
They asked him to first turn around a couple of times and to jump up and down several times. Then they all piped up and said, "You’re 87 years old!"
Standing with his pants down around his ankles, the old man asked, "How in the world did you guess?"
Slapping their knees and grinning from ear to ear, the three old ladies happily yelled in unison -- "We were at your birthday party yesterday!"