I was in Kindergarten. I had my brother who was 8. I cannot remember much about the rules. I know we were not allowed to answer the door for people we did not know and could not let anyone in.
Heck I was 5 years old and walking 2 blocks away and crossing a busy street (with crossing signals) to visit my best friend.

And I would go to the store for my mom when I was 6. And this was in California.

wow times are really different now.