In this stage, the previous eight stages are revisited in reverse order. For example, the sense of "Basic Trust" is tested again as physical health declines and one must rely on others.

While Erikson originally established eight stages of psychosocial development, his wife and collaborator, Joan M. Erikson, added a ninth stage in this work to address the unique challenges of very old age (the 80s and 90s).

The phrase likely refers to , the final book by renowned psychoanalyst Erik H. Erikson . A "deep feature" or major contribution of the book's extended version is the introduction of a Ninth Stage of human development. The Ninth Stage

The book summarizes his lifelong theory that humans pass through stages defined by specific psychological crises. Psychosocial Crisis Early Childhood Autonomy vs. Shame and Doubt Initiative vs. Guilt School Age Industry vs. Inferiority Adolescence Identity vs. Confusion Young Adulthood Intimacy vs. Isolation Middle Adulthood Generativity vs. Stagnation Late Adulthood Integrity vs. Despair 9 Very Old Age Dystonic return of all stages