[EarlsflyinCobra]

Three mischievous grandmas were sitting on a bench outside a neighborhood hangout. About then a Ron61 walked by, and one of the old grandmas yelled out:

"We bet we can tell exactly how old you are."

"There ain't no way you can guess it, you old fools."

"Sure we can! Just drop your under shorts and we can tell your exact age."

Embarrassed just a little, he dropped his drawers. The grandmas stared at him for a while, asked him to turn around a couple of times, asked him to jump up and down for a little while and then they all piped up:

"You're 84 years old!"

"How in the world did you guess?"

The ornery old grandmas, snickered and laughed. Slapping their knees and grinning from ear to ear, all three happily yelled in unison, “Because we were at your birthday party yesterday.”