Performance Arts

Hi! I am absolutely new to the subject of Performance Arts. I have no experience whatsoever in this subject but I would love to perform on stage one day. I have a few questions regarding theatrical performances. 1. Can you become a stage actor without any training? 2. If training is needed, then can anyone recommend a good school to learn Performance Arts? 3. Is it too late to learn this when you are almost 30? Thank you!