Fred and Marie are residents in a retirement home... Marie says to Fred, "I bet I can guess how old you are." "How are you gonna do that?" asks Fred. "Well," says Marie, "You have to unzip your pants." Fred is a little hesitant, but Marie assures him that there is nothing to fear. This method is quick and 100% accurate. So, Fred unzips his pants, and Marie puts her hand in there and feels around for a few seconds. She pulls her hand out. "You're 93." she says. "That's amazing!" said Fred. "How on earth did you know that?" "You told me yesterday."