I turned 22 in 1990, so I spent almost my entire 20s in this decade. It seemed like there was two distinctive parts to it, much like several others. What I remember from the initial half is that it was the first time in my life I could play the radio and hear brand-new music; current music that I liked. The 80s were spent listening to bands who's heyday was in years past, such as Led Zeppelin, The Beatles, Stones, Hendrix, and so on. I and most of my friends completely rejected the music that was current during that decade (80s Springsteen, Madonna, hair bands, etc), so it was a novelty to be able to hear and see bands in their prime in the 90s as well as actually be waiting for their next album. All the musicians of the grunge era were around my age as well, and since I was in a working band at the time, this was also very exciting.
I remember 'paging' my weed dealer, and spending a year watching the O.J. trial on mu Sony Trinitron. I proudly wore a Casio G-Shock and cooked burgers on my George Foreman grill. My little brother was glued to his Game Boy.
The memories of the latter half of the decade for me was dominated by computers and cell phones becoming commonplace items, two technologies that changed the world more dramatically than anything in a very long time, and it all happened at once. My first cellphone was a Nokia 5110; the one with the switchable front plates of different colors. Then I got a StarTAC. All my friends had equally colorful iMac G3s. We all walked around with headphones on; attached to Discmans, which reminded me of the Walkman era from the early 80s. Newspaper boxes and payphones started disappearing from every street corner. I lost my girlfriend to the rave culture; she was 7 years younger than me and started going to them all the time and eventually ended up on crystal meth. I became a professional photographer and had a 2.7mp Nikon D1 that cost me thousands.