I used to take the city bus for a quarter to the public library in the fourth grade, 2 miles away. My mom's the one who taught me to use the bus. I know it was fourth grade because we moved to another city when I was in the fifth grade. That was in 1988. My wife would barely let the kids play in the front yard despite us living in signficantly wealthier, lower-crime neighborhoods.
I wasn't home, and my wife swears she doesn't remember the incident, though younger sibling has offered corroborating evidence.