Jim Goldmans joke reminded me of an oldie but goodie:

Fred and Myra were residents at the local old age home. One day, Fred came shuffling past Myra when she waved him over.

Fred, she said, Ill bet I can guess how old you are.

Okay, replied Fred, go ahead. Tell me how old I am.

Well, you got to pull down your pants first Fred.

What are ya talkin about Myra?

I can only tell how old you are if you pull down your pants Fred.

Shrugging his shoulders, Fred obliges and pulls down his pants. Myra tells him to pull down his underpants as well.

Thinking why not? he pulls down his underpants as well. Myra peers at his privates, inspecting from all angles. She takes his equipment in hand, moves it around a bit, feeling here and there. After some of this manipulation, she looks up at Fred and announces, Youre 87 years old.

Astonished, Fred looks at her in amazement!

How did you figure that out Myra?!?!?

Fred — you told me yesterday.