The danger of brain injury is higher for children , as their brains are n't fully developed yet .
A 2009 study claimed 20,000 professional Muay Thai fighters under 15 years old , though it 's estimated that there may be as many as 30,000 .
The danger of brain injury is higher for children , as fighters ' brains are n't fully developed yet .
A 2009 study claimed 20,000 professional Muay Thai fighters under 15 years old , though it 's estimated that there may be as many as 30,000 .