Starting at about 12 or so, I mowed neighbors lawns and did yard work. There are no teenagers in your neighborhood?
There used to be. When I said I had my yard done by someone years ago it was a pair of teen brothers. They are probably in their 30's and married now. Here in Texas it's done by Mexican "landscape crews". When I am working in my yard, I'll see a crew show up across the street or a few houses down. They'll jump out and do those yards before I am halfway done with mine. The main reason I do mine is that it keeps me from turning a couch potato. I would rather work than exercise because by working I can sweat off a few pounds while accomplishing something.
But the point is that if I were not able to do the work any longer, I'd make other arrangements.