Old Man's War is a military science fiction novel written by John Scalzi. The story is set in a future where senior citizens can enlist in the Colonial Defense Forces to fight against alien species. The protagonist, John Perry, joins the military at the age of 75 and finds himself in a new, rejuvenated body on a distant planet. As he undergoes training and participates in interstellar conflicts, Perry grapples with the moral complexities of war and the sacrifices required to protect humanity. With its fast-paced action and engaging characters, Old Man's War is a thrilling space adventure.
