I have read it. This is a business book explaining how to spend your 30s, when 90% of your life is determined. - Title: Don't Waste Your 30s - Author: Shigehisa Nagamatsu - Genre: Business/Economics - Copies Sold: Over 1.1 million - Content: These 10 years determine 90% of your life. Will you regret it, or move forward? I will sell this as a used item to those who understand.