Well, I think instead of calling ourselves "old" we should think of ourselves as "ripening with age"
I whittled a lot of things a few years back, and now have fabrics that I love in two bins. Mostly small yardages because I make small things. I will sometimes buy new fabric for a project, but I try to not overfill those bins. Sometimes I buy fabric because I love it and never use it because when I look at it it makes me happy. So I keep those happy fabrics around because like sunny days and hot coffee and hearing the birds singing and that photo that makes me smile and linger a bit longer, happy is healthy.
I wouldn't worry about what happens to your stuff when you leave because it's your stuff for you to enjoy. So keep what you enjoy and donate the rest. Who knows? Maybe whoever has to take care of it then may actually keep some as a reminder of what made you happy, and that will give them a nice memory.