mean levels of integration of the self-concept increase until adolescence, decrease up to midlife and increase again thereafter.
In contrast, the trajectory of self-complexity (in the sense of number of relevant self domains mentioned) follows an inverted Ushape function during adulthood.
Staudinger, U. M., & Pasupathi, M. (2000). Life span perspectives on self, personality, and social cognition. In F. I. M. Craik & T. A. Salthouse (Eds.), The handbook of aging and cognition (2nd ed.,
pp. 633–688). Mahwah, NJ: Erlbaum
Freund, A. M., & Smith, J. (1999). Content and function of the selfdefinition in old and very old age. Journal of Gerontology: Psychological Sciences, 55–67.
Filipp, S.-H., & Klauer, T. (1986). Conceptions of self over the life span: Ref lections on the dialectics of change. In M. M. Baltes & P. B. Baltes (Eds.), The psychology of aging and control
(pp. 167–204). Hillsdale, NJ: Erlbaum.
Dittmann-Kohli, F. (1991). Meaning and personality change from early to late adulthood. European Journal of Personality, 1, 98–103
Herzog, A. R., Franks, M. M., Markus, H. R., & Holmberg, D. (1998). Activities and well-being in older age: Effects of self-concept and educational attainment. Psychology and Aging, 13, 179–185.
Campbell, J. D., Assanand, S., & Di Paula, A. (2003). The structure of the self-concept and its relation to psychological adjustment. Journal of Personality, 71, 115–140.
Linville, P. W. (1987). Self-complexity as a cognitive buffer against stress-related depression and illness. Journal of Personality and Social Psychology, 52, 663–676.
Donahue, E. M., Robins, R. W., Roberts, B. W., & John, O. P. (1993). The divided self: Concurrent and longitudinal effects of psychological adjustment and social roles on self-concept differentiation.
Journal of Personality and Social Psychology, 64, 834–846.
Harter, S. (1998). The development of self-representations. In W. Damon (Editor-in-Chief ) & N. Eisenberg (Vol. Ed.), Handbook Handbook of child psychology: Vol. 3. Social, emotional, and personality development (5th ed., pp. 553–617). New York: Wiley.
Marsh et al., 2002
Elbogen, E. B., Carlo, G., & Spaulding, W. (2001). Hierarchical classification and the integration of self-structure in late adolescence. Journal of Adolescence, 24, 657–670.
Diehl, M., Hastings, C. T., & Stanton, J. M. (2001). Self-concept differentiation across the adult life span. Psychology and Aging, 16, 643–654.
Lerner, R. M., & Busch-Rossnagel, N. (Eds.). (1981). Individuals as producers of their development: A life span perspective. New York: Academic Press.