Traditionally 16 as they can be tried as an adult in our state.
I have gone below that , and that limit is 12, yet one the parents has to be present for all classes , the complete class.
Also if married, then both parents must sign waiver.
If divorced, then both parents, and step/bonus parents must also sign , and if they spend on average one night a week with a grandparent then grandparents need to sign.
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And, not one family as gotten all the signatures , as one of they goes NO , I do not want him/her in a martial arts class.
And that is why I ask for all those signatures as one of the parents / or guardian types disagrees they could bring suit.
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Why am I concerned? I start with Rattan canes / sticks first in the adult class.
Children or young adults make impulse decisions. Accidents happen. And parents get upset when a young person is injured even if there is no permanent injuries. (* Not saying parents should not be worried or upset with an injury, I acknowledge the fact, and act accordingly. *)