I have a dell laptop from 1998. It's not capable of running any real software, but it has a serial port that's needed for my weekend car's diagnostics (pre-OBD) and it's old so I don't mind it getting tossed around the car during any spirited driving.
I have a 1995 Dell desktop that still runs which I only turn on to use as a backup file server.
I have a 2001 Dell desktop that is dedicated to running Mach3 for my mill (too slow to do anything else).
I have a 2010 ASUS laptop which is a POS that I hate. It's broken more times than I can count and the battery's cells are toast.
I have a 2012 home built gaming/CAD desktop that I love (SSD, 32 GB ram, etc). I also owned several PC's and laptops in between those above, but they all died various deaths.