In Sonnet 73, what four metaphors does the speaker use to describe himself? What contrast is implied between the speaker and his beloved?

The four metaphors in Sonnet 73 would be;

old age ~ sunset

black-night ~ death

life ~ fire that will go out ~ death (ashes)

In the first quatrain, the narrator compares himself to the late autumn season, that time of year when the trees have begun to lose their leaves and the cold is setting in.

What is one possible theme of the poem ? Sonnet 73 by willam Shakespeare