This book is a valuable resource for those interested in the topic of language acquisition. It provides insightful information on the age factor and its impact on second language acquisition. The authors, Lisa Ryan and David Singleton, draw upon their expertise in linguistics and literacy to present a comprehensive view of this important subject. The book is a trade paperback with 288 pages and measures 8.2 inches in length, 5.8 inches in width, and 0.6 inches in height. It was published in 2004 by Multilingual Matters and is part of the Second Language Acquisition series. The book has been revised and is written in English. It is an ideal textbook for those studying language arts and disciplines.