It is known as the sweet spot of education where the child is able to read and write but the teen hormones have not kicked in yet.
That sweet spot is where information can be funneled to the child and they will never forget those lessons.
This ability to learn well is the reason why Thomas Jefferson was able to finnish all his pre-college learning, including Greek and Latin needed for entry into college, by the 8th grade.
I have analyzed bad curriculum and have been able to identify the very lessons intended to pervert a child's mind.
One such class is the one featuring the Andes plane crash and the resulting eating of dead bodies.
These kind of lessons are intended to train a child to be amoral, essentially teaching to our children how to be psychopaths.
Common Core and most sex education courses are built to do just this, right under our noses.
The learning from these kind of lessons usually do not manifest until the child is a teenager, well after the child has left the scene of the crime.
If you wonder why a teenager would go into a school and shoot his classmates but no one has a clue, you can thank those secretly integrated lessons designed specifically to produce such results.
At that point, permission for "do what you will" is the end of parental authority.