Don't know if I fit in here at all, but . . .
In 1980, after being on my own since 1955 and then with the second wife of fifteen years and our four children, we moved home (Mother & Dad's "dream house that they had been planning since they became engaged - a four br. brick Colonial "full" basement and attic, with a two-car, two-story garage) to take care of Dad in the closing years of his life. My forty years accumulation added into his eighty made quite a large pile of stuff. Three years later when he passed, my only brother and I had to divide his stuff. He took what he wanted, which was minimal, because he had his own fifty years of stuff. Following that, wife and I began giving things away (dining room suite to our daughter, china set to HER daughter, Mother's bedroom suite to our other daughter, the other dining room table to one son, and so on). The auctioneer then took out a sixteen-foot box truck carefully crammed and after that, it still looked like nothing had been moved.
In 2002, taking care of the ancestral castle was just too much for the two of us, so we moved into a 3-br rancher and had another 16-foot box truck go to auction, after sending a bunch of clothing, blankets, etc to the Animal Shelter Thrift Store.
This summer, it was time to declutter/downsize again and our son hauled my pickup with eight loads to the dump, metal recycler, and such. Our daughter took two full loads of blankets and clothing and furniture to the Animal Shelter Thrift Store.
We really are NOT hoarders, but there is still 15% of the stuff left in the basement virtually untouched and my garage is still full (but now organized into an ongoing garage sale).
The moral here is "It is awfully easy to add a bit to any amount of stuff. It then takes a concerted and willful effort to divest, which can become traumatic if approached imprudently. And in the end, it is only material stuff. Better to accumulate good memories, good friends and family."