Here’s another one for you smart ones. You’re driving a bus around town one bus stop at a time. On the first stop, 4 couples get on. Second stop, 1 couple gets off and 7 people get on the bus. 3rd stop, 2 couples and 3 people get off and no one gets on. 4th and last stop 1 couple and 4 people get off. How old is the driver?