Five years ago, I rewrote the end as follows

Now, of my threescore years and ten,
Sixty will not come again,
And take from seventy springs three score,
It only leaves me ten more.

And since to look at things in bloom
Ten springs are little room,
About the woodlands I will go
To see the cherry hung with snow.



A little disconcerting to realize that by Houseman's standards, I only have Five springs left to look at things in bloom. Of course, HE was 37 when he published the poem, so maybe there's a little wiggle-room in there somewhere, ya think?