Andragogy, originally proposed by Malcolm Knowles, has been criticized as an atheoretical model. Validation of andragogy has been advocated by scholars, and this paper explores one method for that process. Current motivation theory, specifically socioemotional selectivity and self-determination theory correspond with aspects of andragogy. In conjunction, these two theories could be used to test and validate the model. This paper explains the correspondence of the motivation theories with andragogy and proposes a process for validation.