Answer:
The theme of the poem is "We need to appreciate every moment of our lives."
Step-by-step explanation:
In this poem A. E. Housman. begins by talking about the beauty and grace of the blossoming cherry trees and indicating that another year has passed. Soon after the poet begins to meditate on how young he is, but will soon grow old. Old age for the poet will come very fast and old age will come with death. So he decides to look at the flowers longer because he realizes that he will have a few years to live before he can look at these flowers. For this reason, we can say that the theme of the poem is that we should enjoy the beautiful moments in our life, because our life is fleeting and the beautiful moments as well.