Never mind the floppy drive you bought in 1990! What of your then-high-end stuff has lasted the longest?
My Maxwell Titan X graphics card, bought in early 2015 is still doing sterling service in my brother's PC. My Acer Nitro 120 Hz 4k monitor from 2019 is in daily use. My colour laser printer from 2014 still chugs away (high end for home use). My Thrustmaster Cougar HOTAS is over 20 years old. I still have my Silverstone FT02 case, though I'm not currently using it.
My Maxwell Titan X graphics card, bought in early 2015 is still doing sterling service in my brother's PC. My Acer Nitro 120 Hz 4k monitor from 2019 is in daily use. My colour laser printer from 2014 still chugs away (high end for home use). My Thrustmaster Cougar HOTAS is over 20 years old. I still have my Silverstone FT02 case, though I'm not currently using it.