Yeah, the biggest delineation is "world without computers and digital electronics" vs. the world after all that proliferated. I'd still consider the 80s and 90s part of the "modern" era, what we used to call the "information age" or "computer revolution".
Pretty much all our modern tech is just more advanced versions of the same shit we already had in the 80s. Even social media (BBSs).
I'd go back to '93. Vs. had just been released, Jurassic Park was in theaters, the US dollar had almost exactly double the buying power it has today, and I still remember how to design web sites using tables.
Event television would be a big thing. I was a senior in college in 93. Seinfeld, Simpsons, Frasier, you had to schedule your day around that. The bar I worked at would even put these shows on instead of playing music and market it as a reason to come in.
Yes, we could record shows on VHS and watch them later, but that was mostly done with daytime soap operas - also a thing that has mostly gone by the wayside.
Landline phones with answering machines would throw a teenager from today into chaos.
Smoking everywhere. Not even California had introduced smoking bans yet.
No TSA. Flying was fun.
Weed possession was a decades long sentence.
You could play around with all kinds of things that were different.