In "loveliest of trees, the cherry now" by a. e. housman, what could be a symbol for something that goes away much too quickly?

Here is "Loveliest of Trees, The Cherry Now" by A.E. Housman.
LOVELIEST of trees, the cherry now
Is hung with bloom along the bough,And stands about the woodland ride
Wearing white for Eastertide. Now, of my threescore years and ten,        
Twenty will not come again,
And take from seventy springs a score,
It only leaves me fifty more. And since to look at things in bloom
Fifty springs are little room,        
About the woodlands I will go
To see the cherry hung with snow.
Based on the given poem above, the symbol for something that goes away too much quickly is years. It would be option D.  hope its help ^^

The first sene: alice was performing a magic trick with a wand and a small spell book that her grandfather had given her. while she was practicing she saw matt who was one of the other contestants, while she was practicing matt bumped in to her and made her say the spell wrong. all of a sudden a swoosh of sparkling purple wind picked them up and put them back on the floor. when they looked at each other alice saw herself and that’s when she realized that they had switched bodies.