“The poet is preparing his young friend, not for the approaching literal death of his body, but the metaphorical death of his youth and passion. The poet's deep insecurities swell irrepressibly as he concludes that the young man is now focused only on the signs of his aging—as the poet surely is himself. This is illustrated by the linear development of the three quatrains. The first two quatrains establish what the poet perceives the young man now sees as he looks at the poet: those yellow leaves and bare boughs, and the faint afterglow of the fading sun. The third quatrain reveals that the poet is speaking not of his impending physical death, but the death of his youth and subsequently his youthful desires—those very things which sustained his relationship with the young man.” This is a comment on the Internet: sonnet 73