An overlooked aspect: older or disabled people may not have the psychological situation of a hoarder, but getting rid of stuff can be physically demanding and some are just not up to it.
Probably not old hoarders though.
My grandparents go to the dog's name before getting to mine. My parents just gets me and my brother's names mixed up.
My other nan, who actually had dementia, on the other hand, could still remember all the ins and outs of which great grand child was going out with who this week, until the end.