It was the stir of the town when an 80 year old man married a 20
old girl. After a year she went into the hospital to give birth.
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 she gave birth again. The
same nurse said You really are amazing. How do you do it? He again
"You've got to keep the old motor running." The same thing happened
the next year. The nurse said You must be quite a man." He
responded "You've got to keep that old motor running." The nurse
then said, "Well, you had better change the oil. This one's black."