This site encourages users to try to answer old unanswered questions. I've made several attempts to wade into the 35K+ unanswered questions, but it is like finding a needle in a haystack. From a review of old meta posts, various aspects of this problem have been hashed and rehashed for years.
The vast majority of these questions are, realistically, ones that are simply not good candidates to ever get answered. Their presence makes it nearly impossible to find the few questions that are. The bloat includes questions that will eventually be removed automatically via rules, but are obvious to a human will not benefit from the wait. Many received some upvotes and/or some initial views, so they have languished without triggering the rules. For many, the comments provided the answer so activity just stopped. Many of the questions are related to obscure hardware or user-specific issues that have long since been overtaken by events and likely of interest to few other people. There are a number of other similar characteristics that are obvious to anyone who has looked for old questions that can be put to bed.
As it stands, very few of the old questions that might get answered will get answered simply because it is too hard to find them. If the site is serious about getting old questions answered, there needs to be a way to separate the wheat from the chaff, to enrich the fishing ground so good candidates are more accessible. One approach is to start with the pool of all old, unanswered questions and peel off layers of poor candidates. The other is to search the pool for good candidates and promote them to an "answer me" pot.
One argument against doing this is that questions in the "poor candidate" pool will never be answered. The truth is that they are unlikely to be answered anyway, and not doing this means that the good candidates won't get answered either.