80s - hair metal, synthwave/synthpop (think hotline miami, vice city, etc), retro games pre/post crash. all in the 8 bit c64/atari color palette.
90s - grunge and the internet revolution. i think we still need some distance from the 90s to really define the nostalgic points, but a lot of the last few years is undoubtedly swallowed in the new millenia hype.
I've heard a few people discuss a games market crash in recent years and was very confused as I lived through that era and didn't remember anything of the sort. It was only recently that I discovered those discussing it were all American - turns out there was a "crash" of sorts but it was very localised to the US. Those of us in the rest of the world still had a thriving gaming scene. Particularly in Europe and Japan (I cannot speak for other areas with any great certainty).