Our approach to adult learners and the learning process is shaped by our knowledge of how adults change and develop across the life span. This issue of New Directions for Adult and Continuing Education reviews the latest work in adult developmental theory in the biological, psychological, sociocultural, and integrated domains, and explores the implications of this work for adult education. Chapters examine how gender, race, and sexual orientation affect our sense of self; explore spiritual development and theories of aging; and offer a way of understanding development in terms of how people use narrative to organize and make meaning of their experiences.