Take In A Boarder

A 90 year old man shows up for a physical. He tells the doctor he is about to marry a 20 year old girl.

- Really? - said the doctor.

- You're healthy enough, I suppose, but take my advice. If you want a happy marriage, you should take in a boarder. Do you know what I mean?

The old man says:

- OK, doc. I'll think about it.

Six months later, the doctor sees the old man on the street. He asks him how his new marriage is working out.

- Great doc! In fact, my wife is pregnant.

The doctor nods knowingly and says:

- So you took my advice and took in a boarder?

The old man winked and said:

- Yep. And she's pregnant too!