My 87 year old sister is a hoarder. She has spent her life going to the shops buying clothes, ornaments and furniture and her house is rammed. She never cleans. I have nearly killed myself cleaning her house twice when she went into hospital, and she screamed at me when I couldn't find the particular pair of trousers she wanted when she was in convalescence (I'd had to go through overflowing cupboards and drawers and a room rammed to the ceiling with binbags full of clothing). Having moved to another part of the country I am no longer able to do things for her, and now she has failing health.
I had very few things growing up, and try to compensate now. Someone mentioned wartime deprivation and I guess that, and living alone, is at the root of my sister's hoarding. The buzz of buying stuff seems to replace the huge vacant emotional space with no special friend and rarely visiting family.
I have a room full of folders containing my sons' schoolwork, certificates etc. which I intend to photograph then give the folders to them to do whatever they want. I also have shelves full of photographs which I was in the process of scanning into the computer, until a cheap inktank prevented the scanner working.
I also have a lifetime's clutter - wedding cake baubles even! I am also in the process of taking a photograph of all these items, then letting them go. The item will be gone, but the memory will still be there, in the form of a photograph, to be stored away and unlocked only if it doesn't cause too much pain. However.... I will still keep relics of my husband's interests in a tiny suitcase: his private pilot's licence etc, and best of all the lovely smell of rifle oil when I open the lid (no bullets or guns or rifles tho!).