I do recognise the phenomenon - but my experience is that this is usually people who don't actually like music, as such!!
So - they are nostalgic for their youth and this stuff was the musical wallpaper for that and therefore has strong associations with it in their memories!
So - when they are listening to the "hits of yesteryear" they are
not thinking about how that is a neat chord progression or things like that - but rather : that was playing when I scored with that hot person of the opposite sex at the school dance - that was playing,the last time I was actually energetic and lively on the dance floor etc. etc.
So - nothing to do with music as such, whatsoever!!