Peace, it was challenged by the US Amish. In the 40s and 50s they pursued in court the right to remove their children from school at 16. They eventually won.

While I was still a kid the Amish started their own schools. I have no idea of what percentage of Amish kids attend Amish schools; I would imagine that in rural areas where there are few Amish the kids would attend public school, as they did when I was a kid.

By the way, I remember I was 9 years old when it first struck me that if we girls all took off our clothes we would all look alike! Precocious I was not.