Instruct: Classify the given Amazon review into its appropriate rating category
Query: Revolutionizing Yourself Before 45

My conclusion after reading this book is that knowledgeable workers outlive organizations, and they are mobile. The need to manage oneself is therefore creating a revolution in human affairs. Because most work is knowledge work, and knowledge workers are not “finished” after 40 years on the job, they are merely bored. So, it's important to reinvent yourself no later than 45 should you wish for a career change.