Three mischievous ladies were sitting on a bench outside a nursing home when an older man walked by..

One of the old women yelled out, 'We bet we can tell exactly how old you are.'
The old man said, 'There is no way you can guess it, you old fools.'

Another of the old ladies said, 'Sure we can! Just drop your pants and under shorts and we can tell your exact age.'

Embarrassed just a little, but anxious to prove they couldn't do it, he dropped his drawers.

The ladies asked him to first turn around a couple of times and jump up and down several times.

Then they said in unison, 'You're 87 years old!'

Standing there with his pants down around his ankles, the old gent asked,'How in the world did you guess?'

Slapping their knees with glee, the three old ladies yelled, - - 'We were at your birthday party yesterday!'