This study aims to identify and describe the principle economic issues associated with individual and population ageing. In addition, the study surveys and assess the existing knowledge - including research by scholars of many countries and different fields in the social sciences - of the economic and social problems associated with ageing. Although the study covers a wide range of issues, it focuses primarily on the economic complexities of individual ageing and the macro-economic problems that arise from age-structure changes in the population. The authors, giving examples from many countries, trace the development of concern for population ageing and examine theoretical concepts and changing demographic conditions. Cross-national econometric studies are cited along with time series and cross-sectional research on individual countries. In assessing the state of the literature on the economic problems of ageing, the authors have attempted to indicate fruitful avenues for further research.