The idea of the conceptualization of adult education has been postulated in the article including its significant differences. The leading distinguishing feature is the personality of pedagogical staff that works with adults. It has been substantiated that the dependence of the functions which are performed by pedagogical staff in the adult education system, on the main characteristics of the society. It has been shown the content of the integral-role position of a pedagogue-andragogue which has 3 elements: subject and content, project and technological, organization and diagnostic. The professional activity of a pedagogue-andragogue has been analyzed as the specialist who professionally organizes and conducts adult training and learning, helps create individual programs of training. At the same time, in his/her activity he/she combines different social functions as well. The most typical are to provide the help in renovating the motivation towards learning and professional activity, to combine the content both andragogical and professional activity of his/her learners, to share the methods of supervising adult self-learning.