A man 80 years of age married a young lady. A year later he took 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 took her to the hospital, another baby. 


The same nurse said to the man and asked: ‘You are something man, 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 got to keep the motor running’. 


She answered: ‘Well, you better change oil, because this one came out black’.