Another word used to describe an extremely advanced state of decomposition.

Beat down, old, wore out, used up, tore up from the floor up...

Broken down with age.

meaning very very old .
incontinence and other problems are also included

worn out or ruined because of age or neglect

synonyms: dilapidated, rickety, run-down, beat-up, ramshackle, derelict, ruined, in (a state of) disrepair, gone to rack and ruin; battered, decayed, crumbling,

when you eat stale chips from the bottom of the bag when you are hungry and that's all you have around

a noun used when one is being very obnoxious, annoying, and or a piece of trash. commonly used when one break up another’s relationship.