I learnt this from the singing of the Yetties, more years ago than I care to remember, more or less as given above by Lady Nancy.

More recently, Johnny Collins gave me another verse - I don't know the provenance, but it goes:

The season is over, the leaves are all gone
Back to the trees they can never return
Tis not so with Man, the Scriptures say plain
Out of the dust we shall all rise again.

Reduces the morbidity rating, depending how much you care about leaves!

Kitty