An adult learner—or, more commonly, a mature student or mature-age student—is a person who is older and is involved in forms of learning. Adult learners fall in a specific criterion of being experienced, and do not always have a high school diploma. Many of the adult learners go back to school to finish a degree, or earn a new one.
Malcolm Knowles's work distinguished adult learners as distinct from adolescent and child learners in his principle of andragogy. He established 5 assumptions about the adult learner. This included self-concept, adult learner experience, readiness to learn, orientation to learning, and motivation to learning.