Five mischievous Grandmas were on a bench outside a nursing home.
A Grandpa walked by, and one yelled out ,
'We bet we can tell exactly how old you are.
'The old man said, 'No way, you old fools.
'One of the Grandmas said, 'Sure we can!
Drop your pants and underwear and we will know exactly.
'Embarrassed , but anxious to prove they couldn't, he dropped them.
The Grandmas asked him to first turn around a couple of times.
The jump up and down several times.
Then they all piped up and said, 'You're 91 years old!'
Standing with his pants around his ankles, the old gent asked,
'How in the world did you guess?'
Grinning from ear to ear, the old ladies giggled in unison --
'We were at your birthday party yesterday!'