This is a problem faced by many of us older jazz collectors with no obvious way to pass on our collection. The logistics of selling individual CDs or LPs online such as eBay are overwhelming. First making the listing and then packaging and mailing each individual CD or LP is tedious and time consuming. Box sets in excellent condition such as Mosaic are sold routinely on eBay for a good price and are worth the effort to list and mail them. Finding a store or college to take the whole collection is difficult and becoming harder each day as streaming music is overcoming owning physical collections. Anything in your collection on CDRs is worthless, even though they may be of rare live performances never released on CD or LP.
The ideal solution if you are not interested in monetizing most of your collection is to find a younger fellow collector interested in acquiring same. Your collection should be listed on some type of spreadsheet such as excel to let him/her know of the magnitude and contents of the collection. How to find this person is difficult. One possibility is via Organissimo. Another is to attend a local record show where many dealers attend and one might be interested. The logistics of moving a large collection mean that the person should live fairly closely to you. For example moving a large collection from Florida to California would be difficult and expensive.
This is a dilemma that should be resolved so you do not leave a wife or relatives with this situation and no solution. You certainly do not want your collection to go to a Goodwill store.