Speak for yourself, it has everything to do with the past world being better than the present or future expectations of same, the very definition of nostalgia.
I'm personally blooming at 52, never been better or in better health and condition, running a faster 10k than I was in high school, I can control this: what I eat and how I exercise. I wish the same success (and peace of mind) for everyone reading this not just Chris; none of which has anything to do with how crummy now is "externally" vs The Eighties (for example), this all falling into the category of "not in my control to change". That I can't outrun 😉