An old man was walking in Amsterdam and passed a hooker standing at her door.
She called out to him, "Granddad, why don't we give it a try?"
He replied, "No girl, that's no longer possible for me."
Replied the hooker: "Come on, what have we got to lose, we can give it a try!"
They went inside. They undressed, and he performed like a young buck, giving it to her three times in a row.
"Oh my goodness", said the hooker, breathless, "and you said that it was no longer possible for you!"
The old guy said, "Oh, screwing is no problem, it's the paying that’s no longer possible!"