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