Riddle Time! You are driving a bus.
You start with 11 people on the bus.
At stop 1, you pick up three people and drop off 4.
At stop 2, you drop off 2 people and don't pick up anyone.
At stop 3, you pick up 6 people and drop off 4.
At stop 4, you pick up 4 people and don't drop off anyone.
At stop 5, you don't pick anyone up or drop anyone off.
At stop 6, you pick up 5 people and drop off 2.
How old is the bus driver?