Just as experience dictates to the ballet teacher the length of time necessary to train his students, so the horse, too, needs time to mature into a great four legged dancer. This fact cannot be obliterated by seeming successes that supposedly prove the opposite. For, even if someone should succeed in training a horse to high school level by the age of eight, this individual occurrence cannot shake the foundations of the classical art of riding, if this dressage horse is completely unsound and unusable by the age of ten.