I loved mowing as a kid, and started with push mower around 9-10. When I was 10-11, my daddy bought me a John Deere riding mower and put me in charge of mowing! I loved it! We lived on a 33-acre property, and there was much mowing to be done. My younger brother handled the push mower around the house and other smaller areas, and he was 8-9 because he’s one year younger than me. I definitely think it depends on the maturity of the child. We grew up fast where I’m from because we lived on a horse ranch and there were ALWAYS chores to do.