Answer:
The poet uses descriptions of the last golden leaves on a tree and the last flames of a dying fire to reflect irony because They both signify that at whatever point an experience ends, our ability to understand it abruptly changes.
Step-by-step explanation:
This sonnet by William Shakespeare presents these elements as a metaphor of the aging process and how the experiences lived during out youth are seeing in a very different way when they have gone and we only have the remaining memories of them all the elements are connected to the visual image of autumn which is the representation of elderly.