18 Year old legs

A fortyish woman is jumping up and down on the bed and singing happily.
Her husband watches her for a while and then says, do you have any idea how ridiculous you look? What's the matter with you?
The woman continues to bounce. Don't care, she says.
I just got back from the doctor's and he says I have the legs of an 18-year-old girl.

Oh really? says the husband. And what did he say about your 40-year-old arse?
I'm sorry, says the woman, but your name didn't come up.