Old Man's War is a military science fiction novel by John Scalzi that follows the story of John Perry, a 75-year-old man who enlists in the Colonial Defense Forces to fight against alien species in outer space. As John undergoes a rejuvenation process and joins the ranks of soldiers, he discovers the harsh realities of war and the moral complexities of fighting for a cause. With its blend of action, humor, and thought-provoking themes, Old Man's War is a space pirate adventure saga that explores the nature of identity, loyalty, and the human will to survive.
