I'm starting to feel it, now. Back in '99 I had a 400mhz celeron, 64mb ram, intergrated video (can you say 'first pc?'). I upgraded it to 128mb ram, that made it a bit faster.
Back in 2001 I bought a refurbed 850mhz Athalon, it's still running. I want to upgrade, but can't afford it. But it runs Civ for me, so I guess I can't be too picky.