Changing seasons are often used in poetry to metaphorically describe the stages of a person’s life. Spring is youth, summer is adulthood, fall is middle age, and winter is old age. By “snow” the speaker suggests that he will look at nature in all seasons, winter included, because there is too much to see and appreciate with his limited time. However, he also metaphorically means that he will continue to go out and look at the cherry trees into his old age.
"will not come again..."See in text(Text of the Poem)
When read with the preceding line, “twenty” is a measurement of age. The speaker is stating that of his total 70 years, he has already lived 20. That it “will not come again” suggests that he is over 20, or that his 20th year has passed.
The noun “score” in this context means a period of twenty years. So, “threescore” is 60 years, onto which the speaker adds 10. In this line, the speaker takes possession of these years with the possessive pronoun “my.” The line can therefore be read as the speaker’s prediction that he will live 70 years.
