My PC is approximately 5+ years old now and still chugging along fairly well. No consoles for me, so all my gaming is done on my trusty old PC.
Civ V late game crashes frequently but is still playable with all graphics set to low and playing against only 4 or 5 other Civs on small to medium maps sizes. Not the epic gaming experience I must admit but still highly enjoyable. It's probably the most cpu intensive game installed on my machine I think.
I'll probably buy a new computer sometime after the new year I would imagine. Besides, looking forward to playing GalCiv III!
(Don't laugh too hard)
Dell Inspiron 530
(CPU) Intel Core 2 Duo/E8300 @ 2.83 GHz
Memory (RAM) 4 GB
Windows Vista Home Premium 32-bit Operating System
(Video) ATI Radeon HD 2600 XT
It still plays a lot of older games (mostly strategy) without even a hiccup... so there.