Pfft. You lot all suck.
My father uses an IBM PC AT. Oh yes. An 8086 device running at an awesome, and quite incredible 8MHz. With 512KB RAM, and a 20MB hard drive (of which 11MB is still free). Purchased in, I believe, 1982. It's not his everyday machine, but he still has recourse to fire it up to reference old material that we never bothered converting. Strangely enough, Windows 2000 Pro isn't too keen to run the dodgy DOS apps.
Internally, it has a hard drive with external electronics. Oh yes, this sucker pre-dates IDE! It weighs about 15Kg as well. It rocks. Screen is a 12" green jobbie. Don't talk to me about graphics cards - it pre-dates CGA.
My Dad rules this competition!
My oldest computer that's still functioning is a Compaq ProLiant 800 server with a single Pentium Pro processor. Runs Red Hat Linux 8 quite happily.