Nice Advice

An 80-year-old man tells the Doctor he is planning on marrying a women of 30, and would he have any suggestions.

"Yes," says the Doctor, "I would advise you to take in a boarder."

A year later at his check-up, the Doctor asks the man how everything is going. He says fine, and that his wife is pregnant.

The Doctor remarks: "so you took my advise and took in a boarder?"

"Yes I did," he replied, "and she's pregnant also....."