Why is the fifth stanza in Fifteen by William Stafford set off from the rest of the poem?

The fifth stanza in "Fifteen" by William Stafford is set off from the rest of the poem to emphasize the moment of reflection and introspection. By isolating this stanza, the poet creates a pause that draws attention to the speaker's contemplation about the passing of time and the significance of each year of a person's life. This stanza serves as a pivotal point in the poem, allowing the reader to pause and reflect on its deeper meaning.