What are the primary psychological, social, and biological factors that define the experience of adulthood and the aging process? Marion G. Mason provides a comprehensive examination of the developmental stages occurring from early adulthood through late life. The text synthesizes research from psychology and gerontology to explain how individuals navigate transitions, health changes, and social roles. By utilizing a life-span perspective, the author constructs a framework for understanding the continuity and change inherent in human aging.

This text is frequently utilized in academic settings as a foundational resource for students of human development. Readers often note the clinical density of the prose, which prioritizes empirical data over anecdotal observation.