Three old ornery grandmas were sitting on a bench
outside a nursing home.

About then an old man walked by, and one of the
grandmas says, "We bet we can tell how old you are."

The old man said, "There ain't no way you can guess it."

One of the ornery grandmas said, "Sure we can! Just drop your undershorts
and we can tell your exact age."

He did.

The grandmas stared at him for a while and then
they all piped up and said, "You're 84 years old!"

The old man was stunned. "Amazing! How did you guess that?"

The ornery old grandmas laughed. Slapping their
knees and grinning from ear to ear. All three happily yelled in unison,
"You told us yesterday.'