Writing is a talent, honeed when one is very young through much reading. One learns everything one needs to know about grammar and sentence structure in the first seven or eight years of schooling. If one is lucky enough to born into a family or society that speaks well, much of that is unnecessary.

There are several different skills that are required - high intellect, creativity which is the result of all areas of the brain being connected, and more.

If you speak to bestselling authors, they will tell you that they could write by a very young age.