I’m not sure how that follows. I’ve never understood the type of “golden age” that we’re talking about here to refer to an unspoiled paradise, particularly one inhabited only by two people. I think the “glorious past” is more of a Greco-Roman idea than a Judeo-Christian one.
I think nostalgia is pretty universal. When we are children, our parents tell us stories about how heroic our grandparents were during whatever crisis happened back then. When we grow up, our own lives are full of dust and sweat, and it is never as glamorous as we imagined our ancestors had it.
There are certainly people who believe that the Dark Ages (a.k.a. the Early Middle Ages) weren’t really that bad: