Research on midlife transitions in women is reviewed, and implications for theories of women's adult development are discussed. Findings on menopause, the postparental period, and the roles of women at midlife are presented. Research on women at midlife suggests that new theoretical models of women's adult development should continue to emerge to accommodate the diversity of women's experiences at midlife. Several theoretical approaches are discussed in light of the research findings, and recommendations are made for future research on women's adult development. Implications for counselors working with women at midlife also are discussed.T he literature on women's adult development would benefit from a more thorough and accurate understanding of midlife transitions because "there is a lack of an integrated body of developmental theory and research from prior studies that is relevant to today's midlife women" (Fodor & Franks, 1990, p. 446). Considering the major studies on adult development at midlife, Gergen (1990) observed that it seems only men survive past the age of 40. In addition, certain myths about phenomena thought to occur for women during midlife, such as the menopausal change of life and the empty-nest syndrome, have little scientific basis (Azar, 1996). Another fundamental problem associated with relating the existing research findings to women today is a growing lack of agreement about how midlife should be defined. For example, does midlife "occur" during the same chronological age range for every woman regardless of her ethnicity, religious orientation, sexual orientation, marital status, employment status, or physiological makeup? Although specific age ranges and physiological changes have been proposed as midlife markers, some researchers have concluded that it is ultimately the individual who defines middle age (Sands & Richardson, 1986). Thus, "when" and "what" defines midlife seems to be quite complex for today's women.Many of the research findings on women at midlife are essentially descriptions of the psychological effects of the transitions women tend to face between 40 and 60 years of age (Barnett & Baruch, 1978;Berkun, 1986;Hunter, 1990;Raup & Myers, 1989). However, it has been difficult to draw conclusions from the findings because of the vast individual differences in women's experiences at midlife.For many women, the middle years represent a wonderful chapter in life's story. They can be a time of enhanced self-esteem and selfacceptance, of gratification at having launched a family, and satisfaction at having fulfilled early career aspirations. . . . For other women, the middle years of 40-60 may be less positive. Children may be refusing to abandon the nest, elderly parents may require time and attention, and long-married partners may have lost their youthful appeal. Work can be drudgery rather than joy, and there may be less vocational success and achievement than one had hoped for. (Leiblum, 1990, p. 495) Attempting to explain these vast differences has driven much of the recen...