Answer:
"Then Leaf Subsides To Leaf," - <u>symbolizes the child becoming an adult and losing all its innocence and childhood. </u>
"So Eden Sank To Grief," - <u>states that the person realizes that they are no longer a child and that they must face the world all on their own.</u>
"So Dawn Goes Down To Day," - <u>means that the childhood of the person is finished and that it will never return.</u>
"Nothing Gold Can Stay," - <u>states that people change and youth will not stay forever. </u>
Explanation: I believe that is what Robert Frost meant when he wrote these lines. Hope this helps ^-^.