In "Old Man's War," the protagonist reflects on his seventy-fifth birthday, marking it with poignant actions that highlight the passage of time and loss. First, he pays a visit to his wife's grave, a moment filled with quiet remembrance and sorrow, emphasizing the emotional weight of mourning a loved one. This act serves as a reminder of the life he shared with Kathy and the impact her absence has on him.

Following this solemn visit, he makes a surprising decision to join the army, suggesting a drastic shift in purpose and direction at an age typically associated with retirement. This juxtaposition of mourning and military service illustrates the complexity of his character and the narrative, as he seeks new beginnings even in the face of significant personal loss. The contrast between these actions sets the tone for the journey he is about to embark on.