The authors of this anthology examine central topics of social gerontology with a view to participation in old age: poverty and securing the standard of living, migration, housing, education and learning, mobility, technology, the senior citizens economy, company-based ageing management, gainful employment of older people, informal and formal support systems, generational relations, compatibility of gainful employment and care, health and nursing care, personnel requirements in work and care for the elderly, neighbourhood-related policy and work for the elderly, demographic concepts, political and social participation. The contributions are classified in the context of quality of life, social innovations, and critical gerontology. New perspectives on old age, as well as challenges and perspectives for research, practice, and politics, become clear.