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Windows 10 reaches 70% market share as Windows 11 keeps declining
(www.neowin.net)
This is a most excellent place for technology news and articles.
SSE4.2 specifically, POPCNT is part of that. It was introduced in 2008, while the previous requirement for Win 10, Win 8, and in Win 7 after a 2018 update has been SSE2 from 2000. So Windows 11 bumps the oldest hardware requirement from 18 years up when introduces to 16/17 years.
FWIW, I believe from Linux Mint 20 onward it doesn't have 32-bit builds so it isn't compatible with processors that don't support x86-64, and the first Intel processor to support that is from 2004.