What is the theme of this poem me..

in my apple-orchard
in the oldest tree
fall has hidden golden leaves.
i looked into the hollow
and saw no apples,
only leaves with frost on them
like marble tilings,
like jeweled
yet there was no

only leaves covered with frost
that sparkled the way my thought
told me.

Aging. This is shown by the poet's use of the leaves, as they are depicted as being old. But, they started out as golden (youth). The hollow symbolises unfulfilled goals and the apples represent the goals. The leaves with frost on them are the old age, because they are no longer golden. But, these frosted leaves are wise because they "sparkled the way my thought told me", which shows they are experienced.