The note about differences is true, the country is pretty complicated and fragmented. But where do you get this 12 years old from? I grew up in the 90s, so thin

The note about differences is true, the country is pretty complicated and fragmented. But where do you get this 12 years old from? I grew up in the 90s, so things may have changed drastically but I remember going to school by myself since 6-7 years old. And it was the same for other kids who wouldn’t live too far from our school. And I’m from Romandie (Vaud, Lausanne to be specific)