I think this is the correct concept.
Human body growth is 20 to 24 years old
10~12 years old is just the stage of sexual growth
In order to protect the health of the human body,
should be publicized tell everyone, about The dangers of using head movements.
But, Will to banned it ?
I feel that we should respect the player.
If it is under the publicized of half a year,
Parents and schools/teachers and others are also know this publicized,
Understand the dangers of this sport,
He and his relatives still agree that he is participating in this sport.
Then it is time to respect him,
Still let her participate,
Not to considering his age,
still let he to participate.
Because any sport, alway will has a few harmful,
It’s like riding a car and easy dying in a car accident. Will we forbidden to take a ride?