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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!“