Old Age, New Science explores the emergence of gerontology as a formal discipline between 1900 and 1960. Hyung Wook Park reveals how scientists began to treat ageing not just as an inevitable decline, but as a biological process that could be studied, managed, and perhaps even modified. By examining the visions of early gerontologists, this book highlights how these experts sought to redefine the later stages of life through a 'biosocial' lens. This is an essential read for anyone interested in the history of medicine, the sociology of ageing, and the ways in which science has continuously sought to influence the human lifecycle.