For me, it's the 70s, even tho it's the decade when the axe fell for the global left, the eclectic fashions, the vibes, the simultaneous sense of cultural defiance, despair, emerging technologies and building dread of an unknowable future that we now know so well, gives it an almost otherworldly quality other decades lack
Also best decade for hair
The 70s, but not the disco high end fashion stuff. The everyday stuff, the cars, consumer products, ads, tv, etc. Idk why, but that decade especially people think of the aesthetics of a very specific place and time during it, and not the wider styles.