When I was 10 y.o. i started out with your basic push mower. I mowed for two years saving enough money to by a craftsman tractor which made me $5,000. Now I own a Craftsman ZTR which i mow 15 weekly contracts with and a spur of the moment job every day, since I can't drive a car, I have to drive my ZTR every where but I haul a trailer with my equipt. in it. But since I live in a neighborhood its not that bad of a drive. I make about $650 per month on a 5 month mowing season so on average i make about $3500 dollars a year which is pretty good for a 14 y.o.