In this science fiction novel, elderly citizens of Earth are given a chance to join an interstellar army, trading their decrepit bodies for rejuvenated, genetically enhanced versions to fight in a seemingly endless war across the galaxy. The protagonist, a widower who enlists on his 75th birthday, navigates the complexities of his new existence, including the physical and emotional challenges of being young again, the camaraderie and loss within the ranks, and the ethical quandaries posed by the conflict with various alien species. As he rises through the military's ranks, he confronts the harsh realities of this expansive and deadly cosmic battlefield.

The 8084th greatest book of all time