I like, but these spare observations need to be even more spare I think. So, I admit it's fussy, but, if I had my way, you'd trim to '...who were married / just before the invention of pain' and excise any whisper of a cliché. I know your views on this point I think, but to be particular not general about it here, I can't see that 'into the middle distance' or, worse, 'wondering / where the years have gone' are doing much.

