I'm no judge of poetry, but this speaks to me, and that's saying a lot. This line:

Decrepitude describes me now. My "sell by" date has long passed.

#loveit!!!
I have a "shelf life" of maybe an hour at the mall, as I used to tell my offspring when they'd drag me there for clothing shopping (kill me! let me shovel manure or detassle corn instead!). Oddly, all three eventually came to embrace thrift shops and outlet stores, and malls are going out of style all over America. I still hate shopping though, which made me a curmudgeon long before I was old enough to claim the title. This freewrite on caducity (what a great word, @mariannewest!) makes my day.