Three old ornery grannys were sitting on a bench outside of their nursing home when an old man walked by. One of the grandma's said....."We bet we can tell you how old you are." The old man said...."There aint no way you can ever guess it". The other granny said, "Sure we can. Just drop your pants and undershorts and we can tell you your exact age". Well he did. The grandmas stared at him for a while then they all 3 piped up and said at the same time, you are 91 years old. The old man was stunned!!! "Amazing!! How in the world did you do that"????? They all started to laugh, slapping their knees and grinning from ear to ear and said..... YOU TOLD US YESTERDAY!!!