Keep That Old Motor Running

It was the stir of the town when an 80-year-old man married a
20-year-old girl. After a year of marriage she went into hospital
to give birth.

The nurse came out to congratulate the fellow saying,
“This is amazing. How do you do it at your age?”
He answered, “You've got to keep that old motor running”.

The following year the young bride gave birth again. The same
nurse said, “You really are amazing. How do you do it?”
He again said, “You've got to keep the old motor running”.

The same thing happened the next year.
The nurse said, “Well, well, well! You certainly are quite a man!”
He responded, “You've got to keep that old motor running”.

The nurse then said, “Well, you better change the oil. This one's black”.