Surprised by Joy is one of C.S. Lewis's books and Joy was his surprise wife, late in life, but life has other ideas than happy ever after, love found and soon parted by cancer.

Surprised by Joy

Life gives you grief, a companion
for your winter years
To end in tears, as the wind above
takes another falling leaf.

May-December love among our books;
Now, it's all about believing in other trees,
other walks through the wardrobe
for you and me, beyond all grief.

Life gives you sorrow, to accompany
your winter by the fireside
and ends with tears, the wind blowing
taking her away from your side.

Our book, the love of May and December.
Now, it's all about trusting other trees,
other ways through the wardrobe
for you and me, beyond all sorrow.

Don't be fooled by a title,
there's nothing of joy in it
I'm surprised you fell for it;
Love and grief are co-mingled.