A practical book for re-evaluating how to live in your 30s. - Title: Don't Waste Your 30s - Author: Shigehisa Nagamatsu - ISBN: 978-4861003195 - Number of pages: Approximately 200 pages Thank you for viewing. There are some folds, scratches, and stains on the top of the book. There is no problem with reading, but please check the condition in the photos before purchasing.