Personally, my interest in retro stuff is pretty much just my interests not changing from when I was younger. It's not really a nostalgia thing, though. I still have a lot of the same interests I did as a kid, but I now have the means to engage with them, whereas when I was a kid I couldn't really watch or read a lot of things, much less play a large variety of videogames, or use the internet freely. So, as an adult I started watching, reading, playing, and just generally doing stuff I wanted to as a kid, and I really, really enjoyed all of it. This started me on being interested in retro media in general, retro fashion, and old internet. It's kind of just escalated from there, with me embracing now-dated interests I couldn't have when I was younger and developing new interests in retro stuff because of that.