It is not necessarily true that most successful authors start writing late in life. The age at which someone starts writing or becoming a successful author can vary greatly. Some authors start writing and publishing their works at a very young age, while others may wait until they are older and more accomplished in their field. It depends on the individual, the inspiration they receive, and their personal circumstances. What is important is that authors continue to pursue their creative passions and to create works that resonate with their readers, regardless of age or experience.