It's good to want to be a taekwondo coach. Can strengthen the body, cultivate one's morality, and gain the respect of others. However, after all, it is a martial arts sport, which requires very hard preparation. Because you want to be a coach rather than an amateur, a coach should be an expert in the industry. No matter how old you are, you should be mentally prepared. You can consider joining a sports team when you are 20 years old. If you are older, you can start from the martial arts school and learn to be a teaching assistant, so that you can mature step by step. Both my students are full-time coaches, and their income is not bad. I hope I can help you. (Tianjin Kangying Fitness Center-Thailand budokan)