You're old :D

My oldest piece of hardware that is still in use is a NEC Multisync XV15, a 15" monitor built in '94 according to the label. Still works fine. I almost threw it away last year with a bunch of other old hardware, but forgot it in the end. Later I found out, that one of my servers spits out a very strange signal over D-SUB, which none of my LCDs is capable of handling, I assume it forces a higher refresh rate or something, but the NEC can work with it. So it is my designated server monitor, which I have to carry around everytime something bad happens and I lose remote access.

Aside from that, I still own my first self-bought CPU, a Pentium 4 HT 550 with 3.4GHz and Hyperthreading from '04. I supposedly still runs, but I only have one LGA775 board left and that is in use. Impossible to cool that thing anyway.