There was the elderly man of 80 years who told his doctor that he was about to marry a 20-year-old. The doctor said, "That's great", but thinking of the young bride, said, "Why don't you also take in a young boarder after you get married."
The man said, "That's a great idea, Doc. We'll do just that."
A few months later, the Doctor saw the 80-year-old man, and asked him how he was, and how was his marriage to the young wife?
The man replied, "Fine Doc. And she's fine, too. As a matter of fact, she's pregnant!"
The Doctor smiled, and asked, "And how is the young boarder?"
The man replied, "Oh, she's pregnant, too."