The 84 Year Old Man

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

About then an old grandpa walked by, and one of the old grandmas yelled 
out saying, "We bet we can tell exactly how old you are." 

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

One of the ornery grandmas said, 

"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 and said, "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!"