My daily driver home machine is an i5-760 (Released in 2010!) with a GTX 1060, and it works GREAT. I play lots of RTS-like games in 4K via Steam (Stellaris, Civ, Timberborn, Factorio, Valheim, etc) and there's absolutely no problem whatsoever. The "pcmasterrace" mentality that makes you think nothing works without the latest & greatest CPUs & Graphics is just blatantly false.
I've always run Ubuntu on it as my daily driver, and I think that's part of my success. Windows machines of this age are seem to be more susceptible to long-term performance degradation.
As a comparison, I routinely use it side-by-side with much more recent machines (Intel 10th gens) provided by my workplace, and all the machines feel nearly identical in speed and performance to my 12-year old beater.
My only regret/hope is that my ancient motherboard doesn't seem to support more than 8G RAM, which is a bit annoying given how cheap memory is at this point.