The basic requirements of ballet are three long and one small, long neck, long arms and legs and small head. As for age, everyone is different. In our country, it is not too late for boys, but it may not work for girls, because it is difficult to practice basic conditions such as softness. By the way, foreign actors and students are longer than our domestic dancers because their diet and training are different from ours, so our standards can't be compared with them. If you want to find a professional teacher for training, you'd better go to a professional school for training. I can introduce you to several key ballet training places in China, such as Liaoning Ballet, Beijing Dance Academy and Shenyang Conservatory of Music, which are all good. You can think about it.