In regards to right brain development, the earlier the better. In other words, the older the child gets, the harder it is to expect better results. Generally, it is said that 6 years old is the time limit. However at HEGURU, we set the limit to the age of 9.
If the child really shows interest in the activities that we do, there are cases where children over 10 have successfully developed their right brain. The key is for the child to take pure interest.