A man 75 years of age married a young lady.
A year later he carried her to the hospital, and she had a baby.
The nurse said to the man: “At your age, how do you do that?”
The man answered, “You just have to keep the motor running. “
Another year passes, and the man carries her back to the hospital, another baby.
The same nurses said to the man and asked: “You are something else, how do you do that?”
He said, “I told you that you just have to keep the motor running”.
Another year and back to the hospital for another baby.
The same nurse said: “You are unbelievable, how do you do that?!”
He said: “You go to keep that motor running. “
She answered: “Well, you must change the oil, because this one came out black. “
This joke is included in the Black Book of Jokes. You can order it from here.