My grandmother and grandfather maintained a farm while both worked in the mill. Mornings started at 4:30am six days a week.
Grandma had a picture with all of the young girls at the mill, and would always point out a couple of the unmarried girls who were 16 in the picture and say that they were old maids.
It is possible, maybe likely, that we have extended childhood too far, and I am sure that given the right upbringing, my 11-year-old daughter could function just as well as my grandmother, but I have not prepared my daughter for that type of life. My daughter has never been required to start the day with chores; she has never been responsible for others. If we are going to change how we treat teens, we need to start a lot younger and change how we raise children.