There is no end to learning, dance is the same, if it is for the examination, of course, the earlier the better, if in order to strengthen the body, as long as the coordination of the limbs can learn, of course, the older to pay attention to bone problems.
After graduating from elementary school, you can start learning classical dance. To be honest, there is no "classical dance" specifically for children. The so-called folk dance and classical dance are all categorized as such only after entering a professional dance academy. Therefore, you may want to let your child learn Western dance first, and wait until after elementary school to see how his/her interest and physical growth will be. Because of the classical dance, the most suitable for the "long" body, then, the basic body can already be seen.