I was mowing lawns with an old time push reel mower at around age10.
10? Clear case of arrested development.
I was born during WW2. When my father came home after the war, the only mower we had was the same thing everyone else had -- a push-operated, reel type mower. When I was about 5 years old, my grandparents took me to a toy shop "downtown" and bought me my very own, scaled-down reel mower. I'm not talking about some tin or plastic toy that looked like a reel mower. I think this thing was probably a genuine mower made for doing edges and trimming. The construction was exactly like my father's "big" mower -- only higher quality. The blades only cut about a 12" swath, though.
I still have it -- it's down in the basement.