Guess My Age

[erhein]

An elderly man walks up to an elderly woman at the nursing home. He says, "I bet you can't guess how old I am." The woman says, "Pull down your fly." He does so and she reaches her hand in, moves it around a bit, gives a couple of tugs and says, "You're 87 years old." He says, "That's amazing. How did you know that?" She says, "You told me, yesterday."