Few studies concerning siblings have taken a lifespan approach, i.e., studying sibling relationships from childhood to old age. To outline the developmental changes that occur in the quality of the sibling relationship during various periods of the life cycle and to test the feasibility of devising a coding system to identify such changes, 47…

Concludes "that the one seemingly serious effort of Baltes and Schaie to contest the points of the Horn-Donaldson criticisms only brings us around to the same sad conclusion: that no matter how one looks at the Schaie data, it suggests that, on the average, there is age decline in many important abilities of intelligence." (Author/JM)

Summarizes the conduct and results of the Seattle Longitudinal Study, an investigation that has assessed mental abilities in more than 5,000 adults and has followed some for as long as 35 years. Integrative findings are presented on age changes, cohort differences, factor structure, individual differences, and interventions. (SLD)

This textbook is designed to introduce undergraduates to the scientific study of aging in adults. Among the topics covered in the book's 15 chapters are: approaches to the study of adult development and aging (research methodology and related issues, a life-span perspective, ethical issues); theories in the study of adult development (models of…