The poetic persona, commonly interpreted as William Shakespeare himself, is an observant and deeply affectionate narrator. He closely tracks the passage of time through the changing seasons, noting the shift from cold winters to hot Junes. He desperately wishes to preserve his companion's physical perfection, eventually forcing himself to recognize the stealthy, clock-like progression of aging that affects everyone.

An unnamed young man who serves as the central focus of the speaker's attention and affection. He is the physical embodiment of youth, characterized by a "sweet hue" that appears unmoving despite the changing seasons. While he remains a passive subject in the text, his physical presence anchors the speaker's reflections on time, nature, and mortality.