My son is about to be 10. We have a self propelled mower. And dad is out there w/ him now!
My son reads every warning there is! LOL! So naturally he tells dad, the mower says do not let children near. Do not let anyone under the age of 12 use.
I wanted to get an average age so I can let him know. He tends to worry about things that go against "the law" as he puts it! :)