School-age language is a research domain and academic concept focused on the acquisition, development, and use of language by individuals typically aged 5 through 18, corresponding to the formal schooling years. This field investigates the complex refinement of linguistic systems, including advanced syntax, abstract semantics, sophisticated discourse structures, and pragmatic competence, highlighting their critical role in literacy, academic achievement, and social integration during these formative years. Its significance lies in understanding typical developmental trajectories, identifying and addressing language impairments, and informing educational practices.