Old Man's War by John Scalzi

Old Man's War by John Scalzi, 413 pages

From the MARC: "Enlisting in the army on his seventy-fifth birthday, John Perry joins an interstellar war between Earth and alien enemies who would stake claims on the few existing inhabitable planets, unaware that the conflict involves much more than he understands."

It's been awhile since I've read this series, and since a new book is coming out later this year, I wanted to refresh myself. I have more life experience during this reread, and different parts of the story hit different emotional buttons. The older I get, the more I realize that John Perry's decision to join the interstellar navy at age 75 doesn't require the same level of disbelief my younger self needed.