Book excerpt: Two "megatrends" of modern culture are rapid population aging and the inexorable advances in various technologies encountered by the population at large. This comprehensive volume explores the intersections of technology with aging and serves as both a primer and reference for educators, students, researchers, and practitioners. It includes concepts from the basics of gerotechnologyóperson-environment fitóto the core activity fieldsócomputer and assistive devices and their practical applicationsóto models, or prototypes for technical development and its application to everyday life. Thought-provoking concluding chapters address ethical concerns for the future as well as offer new perspectives or context to ideas and innovations explored earlier.