Bilingualism Across the Lifespan examines the dynamics of bilingual language processing over time from the perspectives of neurolinguistics, psycholinguistics and sociolinguistics. This multidisciplinary approach is fundamental to an understanding of how the bilingual's two (or more) language systems interact with each other and with other higher cognitive systems, neurological substrates, and social systems - a central theme of this volume. Contributors examine the nature of bilingualism during various phases of the lifecycle - childhood, adulthood, and old age - and in various health/pathology conditions. Topics range from code separation in the young bilingual child, across various types of language pathologies in adult bilinguals, to language choice problems in dementia. The volume thus offers a broad overview of current theoretical and empirical approaches to the study of bilingualism. It will interest and stimulate researchers and graduate students in the fields of linguistics, neuropsychology, and developmental psychology, as well as in foreign language teaching, speech pathology, educational psychology, and special education.