Im planing to open gay kickboxing club, Im not shore if guys and girls younger than 18 could apply to train?

Im planing to open gay kickboxing club, Im not shore if guys and girls younger than 18 could apply to train?I would like to train new generation of gay boys and girls to teach them how to play this sport and become future champions in order to do that they would have to start young as 15 or 16 years old.Im not shore if that would be illegal.I would love to do that because there is a lot and little bit les gay guys out there training among straight people and i remember when i was jung and train among straight boys it wasn't pleasant you cant tell them that you gay and they keep asking you about girlfriend .....you cant be your self and effect your training