With very few exceptions, younger people are never going to be interested in vintage movies. That has always been the case. When I was growing up in the 80s, almost no one wanted to watch anything that wasn't new, and that was at a time when there was comparatively little original content being produced. Now, there's more than anyone could conceivably watch, even if you spent every waking moment trying to do so. Also, fewer and fewer people under 40 have disc players of any kind, or cable subscriptions, so the only vintage films they're likely to encounter are those on Netflix, which are buried under a mountain of new programming.