I use a 2008 Dell Inspiron laptop as an office PC. I upgraded the CPU, which would be absurd for a new notebook. I also upgraded to 4 GB DDR2, and an SSD. It still works great!
I think it’s always best to keep things maintained and continue using them instead of buying new things. Maybe some of us have a bunch of old stuff laying around. But what stuff are you still using?
I have a Logitech UltraX keyboard in use with my primary computer. Has to be 20 years old.
I have a Firewire PCIe card and a Focusrite Saffire Pro audio interface. Think I got that in 2011.
I think it’s mostly interesting to hear what very old hardware people have in use with/as their primary PC than as a secondary PC, router, NAS, etc. I think we all shift our old hardware to those tasks.