Human aging is perhaps the most complex and important subject that will be facing science and societies in the next century. People seem to be living longer and remaining more active than their parents and grandparents, caused by to social and demographic shifts that must be accommodated by society. On the other hand it presents perplexing questions about the underlying processes and determinants of healthy aging. This book gives a design for research that will increase our understanding of the factors that influence healthy aging and can lead to improvements in reducing the levels of disability in the population. Its focus is on bio-behavioural and psychological factors contributing to healthy aging. Since human aging is determined by many interacting conditions inside and outside of the organism, research should concentrate on ecological relationships between the human organism and its social and physical environment. Not only individual characteristics associated with aging are discussed in this book, but also their impacts on society. The information presented in 'Aging in Europe' has not been available in any single source before. In many ways this book provides a model of gaining knowledge through cooperation that should guide us in the next century and beyond.