Three mischievous old

Three mischievous old Grannies were sitting on abench outside a nursing home.
When an old Grandpa walked by and one of the old Grandmasyelled out saying,“We bet we can tell exactly how old you are.’
The old man said, “There is no way you can guess it, you oldfools.”

One of the old Grandmas said,“Sure we can! Just drop yourpants and under shorts and we can tell your exact age…”
Embarrassed just a little, but anxious to prove they couldn’t doit, he dropped his drawers.

The Grandmas asked him to first turn around a couple of timesand 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 gentasked, “How in the world did you guess?”
Slapping their knees and grinning from ear to ear, the threeold ladies happily yelled in unison…”
We were at your birthday party yesterday!”