I've read this book at least five times, and just finished my third or fourth listen to the audio book.
That pretty much sums it up, I think!
Along with many other 75-year-olds, John Perry joins the Colonial Defense Forces with the primary goal of becoming young again. The CDF works as a military unit that protects human colonist on numerous worlds, using Earth as a recruiting grounds for colonists (from third world countries) and soldiers (from first world countries).
Scalzi has crafted a great series opener for a Military Space Opera delving into bio-engineering, cyber-additions, and questioning the meaning of humanity amidst a backdrop of high action. Scalzi manages to be thought provoking while developing interesting characters and sustaining an intensity through military operations.
Loved it. Loved the various forms of alien life, customs and adventures. Loved the idea of a new available to us at a time when we can clearly see the end of this life. Loved the idea of new and augmented bodies. Feared and questioned the idea of such a governmental body as the CDF without obvious oversight.
Any fool can know something the point is to understand!
Great story telling and good twists throughout. Better adult SciFi fair for the AARP crowd.
Hike and Paddle Guide
I listened to Old Mans War Twice and enjoyed it both times. It's easy listening, decent action with an interesting premise and plot.