Here I can answer a question by the way. Since it is not too late to learn calligraphy as an adult, is there a suitable age to start calligraphy? Personally, I think this should start at least after ten years old. Even later, from the age of thirteen or fourteen, it is entirely possible. In my opinion, we should consider the marginal cost, especially the marginal cost of time. The study of calligraphy is half in hand and half in brain.
If a child's mind does not develop to a relatively mature state, it is difficult for him to achieve high self-control and understanding of calligraphy. Many good children around me are obedient children. But I can feel that these obedient children can write well as long as they listen to the teacher. This is true to some extent, but it is more important to understand why the teacher wants you to write like this.
For adults, this problem hardly exists. Whether adults or children, when learning calligraphy and choosing teachers, the first level will go through a process of identification, which is actually a complicated process. In my opinion, many students who study calligraphy have limited their calligraphy level and style because of this first step. For example, you may accidentally hand in Tian Yingzhang A and practice for a long time, but you don't know that you turned around at first.