Sorry I couldn't find Abe's joke topic but wanted to add another one .
Three old grandmas were sitting on a bench outside a nursing home when an old granpa walked by. One of the old grandmas yelled out, "Hey, we bet we can tell exactly how old you are!"The old man said,"There is no way in the world you can guess my age". One of the grandmas said "Sure we can, just drop your pants and undershorts and we can tell your exact age". Embarrassed and anxious they couldn't do it, he dropped his drawers and undies. The grandmas first told him to turn around a couple of times and then jump up and down several times. He did it and they all called out in unison, "You're 87 years old". Standing with his pants around his ankles the old gent asked, "How in the world did you guess my age"? Slapping their knees and high-fiving, the old ladies said in unison......."We were at your Birthday Party yesterday".