Apple generally provides 6-8 years of OS support for hardware. My 6.5 year old 2019 Macbook Pro works fine with macOS 26; macOS 27 will drop support in September 2026; macOS 28 will drop Rosetta Intel support. macOS 26 get updates thru September 2028 at which point all Intel mac hardware will be >8 years old.
Homebrew 30d says 27% Intel
My gut says 20-25% is a reasonable ballpark.
Apple generally provides 6-8 years of OS support for hardware. My 6.5 year old 2019 Macbook Pro works fine with macOS 26; macOS 27 will drop support in September 2026; macOS 28 will drop Rosetta Intel support. macOS 26 get updates thru September 2028 at which point all Intel mac hardware will be >8 years old.
[1]: https://store.steampowered.com/hwsurvey/processormfg/
[2]: https://formulae.brew.sh/analytics/homebrew-os-arch-ci/30d/