Sorry to hear about your back.
(Especially if that ex-Christmas tree isn't even really so "living" after all.)
I can definitely relate to the old body not performing nearly as well as it used to, and I'm only forty five years old.
(I gotta start taking better care of myself.)
But, as the cliché goes, getting old is still better than the alternative.
Good luck with your vendetta against that tree.
(Myself, I'd get back at that damned mud.)