My mother is 84 and keeps buying duplicates of things she already has. For example, she has 5 containers of drain opener, 7 funnels, 4 containers of WD-40, 3 bottles of bleach, 3 bags of sugar, 2 bags of flour, etc.
Recently, she purchased another set of plastic clothes hangers. She has at least 2 dozen of these hangers that she's not using...they are in plain sight. When I asked why she had purchased another set, she got angry and said that she had clothes that needed to be hung up in her closets (she has 3 closets in her 2 bedroom apartment). This isn't true. Any of the clothes that need to be hung up are already on hangers.
She rarely bakes and, if she does, she makes a Jiffy cake mix or some other dessert that has all the ingredients in the box. So, I see no need for so much sugar or flour.
She still drives and goes shopping by herself.