Old Man's War, written by John Scalzi, is a thrilling space opera that follows the story of John Perry, a 75-year-old man who enlists in the Colonial Defense Forces to fight against alien species across the universe. As John undergoes a rejuvenation process and joins the ranks of soldiers, he discovers the harsh realities of war and the sacrifices required to protect humanity. With its blend of action, humor, and philosophical musings, Old Man's War has become a beloved entry in the genre.
