Having moved home 21 times by the time I was 21, had the usual shifting rented accommodation before I married and then moved 5 times since then, moving house doesn't really bother me. We have been in our current house over 20 years ago and I sometimes rather fancy all the upheaval and excitement of moving home again
Decluttering doesn't bother me either 1) because I am always decluttering, so there is little or no 'clutter' in the house 2) because, while we might consider moving because the garden may get too much, our plan would be to move into a similar sized house in a local town centre position with a small town garden.
We currently live in a large 550 year old 4 bedroomed Listed house and use every room in it for something or another, every bedroom but ours has several alternative uses. If we ever move we will be looking for something of a similar size, but would prefer Georgian (genuine, not repro). We are fortunate that if we needed care we can afford to buy it in.
As for retirement flats. I worked for 10 years as a Home Visitor for Age UK. I have lost count of how many retirement flats I visited, and I didn't see one that didn't make my heart sink, usually tiny cramped rooms with no space for hobbies, proper dining tables or entertaining, and none had proper storage or space for hobbies or other interests.
The one exception was the site developed by the Joseph Rowntree foundation on the outskirts of York, Hartrigg Oaks, Here the large spacious 2 bedroomed bungalows all have a straight staircase, built with chair lifts in mind, at the end of the very large living room. The staircase leads to a huge open room in the roof, that can be used for whatever you want. A friend lives there. She uses the space as a library, study and rehearsal space for the string quartet she is part of. Someone else has a full operational wood working workshop up there, others use it for crafts, grandchildren etc. She has a small back yard and a previous occupant put a small shed there. I have yet to see any other retirement development that offers anything like this amount of flexible space. My son lives in York, but, unsurprisingly, to get one of those bungalows, you need to put your name down at birth!
I appreciate all the advantages of retirement developments, security, no decorating or gardening, even being in an 'age-exclusive' development, but we would hate it.
DH will still be fiddling with some little repair job on his death bed. He would be totally lost without space for his tools, and his various projects. Both of us would be lost without our large library/study with its big double desk and book-lined walls. I want space for my sewing.
My family have a history of living to advanced old age still living comfortably in their own homes within the wider community and I see our future doing exactly the same.
Sorry, Pegasus, you are ideal for some but just not us.