I reckon it'll be the number CPUs (ie Intel i7), so not pentiums or celerons.. and maybe the 8th gen for intel? (they were released in 2017 I think, so therefore they are probably about the right age). However it is good to remember that people always find workarounds so Microsoft will probably put high requirements like this however if you have older hardware you shouldn't worry too much (unless it is really old!)
In terms of AMD, I think there will be less support for the older chips. I personally have a 3100 AMD chip and I think the latest is the 8000 gen. However AMD is more confusing, but I think considering my chip was released in 2020 it should still be supported.
So I believe that pretty much anything above 2017 should be guaranteed to work...? What does everyone else think?