Swedish folk have a process known as "death cleaning"
The concept being as you move past retirement, you need to start getting rid of clutter before you die, so that you don't burden your family with crap.
My plan is to find an apprentice as I age. I hope it will be my son, he's 7 at the moment, and is currently a hyperactive clone of me. But, if he decides on a different career plan, then I'll take on another apprentice to help out on weekends/school holidays with Expat Audio. (most likely at a loss for me).
At some point, he (or she!) will be gifted the lot. My wife certainly doesn't want to deal with my crap.
I tend to think of it like a business. The actual value of gear, for a business is amortized over a number of years. At some point it's worth zero to a company, even if it's worth something to normal people. All the bins of parts, all the microphones (that are already 20 years old) and the 9 guitars hanging on the walls are worth zero to be as a business by the time I roll on.
The only thing I really care about is if they are put to use after I roll on. Getting money out of it isn't worth the effort of listing and trying to sell etc. I want to avoid landfill where possible.