It was the stir of the town when an 80 year old man married a young, twenty year old woman.

A year later, she went into the hospital to give birth. The nurse walked into the waiting room and congratulated the old fellow. "This is amazing. How do you do it at your age?" The old geezer answered, "You've got to keep that old motor running."

The following year, the young woman gave birth again. Once again, the same nurse approached the old guy and begged the question, "How do you do it?"
Again, he replied, "You've got to keep the old motor running."

Well, sure enough, another year passed and the young woman gave birth yet again. The nurse said to the old fellow, "I don't get it - you must be quite a man." The old geezer again reasoned, "You've got to keep that old motor running."

"Well," said the nurse, "you'd better change the oil in that old motor because this one's black!"