In a nursing home, an Old Lady said to an Old Man, "Drop your pants and I will tell how old you are."
The man said, "Really?"
The Lady told him that it was true, so he dropped his pants. The lady studied him carefully, then said, "Hmmm....you're 85 years old."
The man, in a state of total shock said, "Wow. How did you know"
The woman replied, "You told me yesterday."