I was still running a Q6600 (a 2.4 gHz quad core from 2007) until a few years ago. It ran most things acceptably for its entire life - it wasn’t until around the time of PS4 Pro/Xbox Whatever ports that it could no longer keep up, and even that was largely due to the other components I was restricted to on such an old motherboard.

That thing was also a tank. The CPU cooler was stock and the thermal paste had degraded and separated to the point it idled at 65c, but I never had a single hardware fault in nearly fifteen years of running it. I kind of miss it.