The article is devoted to empirical testing of a hypothesis on a system-forming role of ego-identity from the conceptual perspective of the dynamics of ego-identity in the normative developmental crises of an adult. Structurally the personality maturity is a system that includes personal new-formation and achieved ego-identity. The elements of the system are the factors "Achieved ego-identity", "Hardiness", "Life meaningfulness", "Values of predominant society orientation", "Values of spiritual satisfaction and creativity", "Dissatisfaction with self-realization". The achieved ego-identity is a necessary component, and condition for the achievement of personality maturity. (C) 2013 The Authors. Published by Elsevier Ltd.