Originally Posted by NoComments

An 80-year old man was having his semi annual check-up and the doctor asked him how he was feeling. "Not very good. My wife is 21 and we have sex problems" he complaineded.

The doctor considered this for a moment, then said,
"Due to the large difference in age, if I were you, I'd make sure you get yourself a substitute.

6 months passed and the 80 years old man was back to see a doctor for his semi annual check up. "Doctor, your advice was very good, everybody is happy and my wife is now pregnant."
This is a good news said the doctor, and how does your substitute doing?

-Doc, the substitute is fine and she is pregnant too!