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Syntactic maturity refers to a speaker's ability to produce complex sentences through appropriate use of grammatical rules and the combinatorial process of language elements. This topic is of great relevance in linguistic studies today given its scope in measuring syntactic maturity and the level of syntactic complexity exhibited by language users in written production. Therefore, this article aims to examine the state of the art on syntactic maturity and its methodological evolution. To fulfill the research objective, documentary analysis was used, specifically using the databases Google Scholar, Scielo, Dialnet, Redalyc, marcoELE, ReGrOC, Redalyc, Academia Edu, virtual libraries, and university repositories, among others. The research reveals an extensive bibliography related to studies of syntactic maturity, especially in primary and secondary school students. All of these studies applied the syntactic maturity indicators established by Kellogg Hunt, with some variations incorporated by the researchers, such as profession, discursive mode, and time spent online. Similarly, the studies show that syntactic maturity is directly related to an individual's level of education. It is important to note that the research reviewed only addresses written production, not oral discourse, a task that remains open for future research.