Old Man's War, written by John Scalzi, is a space war science fiction novel set in a future where humanity has colonized other planets. The story follows John Perry, a 75-year-old man who enlists in the Colonial Defense Forces, a military organization that recruits senior citizens to fight against various alien species. The book explores themes of aging, mortality, and the ethics of war. With its fast-paced action and witty dialogue, Old Man's War is a thrilling read for fans of space war science fiction.
