I think we're talking old enough for their free bus pass. You'd probably end up 'triaging' them a la Warday. If they've still got all their marbles and can move themselves without assistance, then they'd be useful for childcare, teaching etc. If they're doubly incontinent and can't remember what day it was...
As for corpse disposal, mass grave would be the easiest option if you can get a digger to work.
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