This collection brings together two areas of research that are currently receiving great attention in both scientific and public spheres: cognitive aging and bilingualism. With ongoing media focus on the aging population and the need for activities to forestall cognitive decline, experiences that appear effective in maintaining functioning are of great interest. One such experience is lifelong bilingualism. Moreover, research into the cognitive effects of bilingualism has increased dramatically in the past decade, making it an exciting area of study. This volume combines these issues and presents the most recent research and thinking into the effects of bilingualism on cognitive decline in aging. The result is a state-of-the art collection on the effect of bilingualism on cognition in older populations for both healthy aging and aging with dementia.