So your driving this bus, there are 30 workers to pick up, and 13 get on at the start. At the first stop, 3 people get off and 2 people get on. At the next stop, no one gets off and 5 people get on. At the stop after that, 8 people get off and 6 people get on. After that, only 2 people get off. And after that, 1 person gets off and 7 people get on. Now... How old is the bus driver?