Playing in your yard isn't really "minimal supervision". You probably just didn't know how often your parents checked on you. And you would have known that your parent could just look outside and see you.
As a 8 or 9-year-old, could you go to a friends house, to the store, or to school without parental supervision?
Did you have safe bike lanes to do this? Was there safe public transportation? Sidewalks on busier streets? Safe crosswalks where the cars are supposed to stop by law - and are those laws enforced heavily to keep you safe? Could you play independently outside of your yard?
As a 8 or 9-year-old, could you go to a friends house, to the store, or to school without parental supervision?
Did you have safe bike lanes to do this? Was there safe public transportation? Sidewalks on busier streets? Safe crosswalks where the cars are supposed to stop by law - and are those laws enforced heavily to keep you safe? Could you play independently outside of your yard?