Microsoft distinguishes support duration based on the edition of Windows 11 you are running:
Microsoft releases major (often referred to by their internal code names like "22H2" or "23H2") once per year. These updates are cumulative, meaning they bring new features but keep the core operating system version the same. windows 11 lifecycle
This requirement effectively cut the lifecycle short for millions of perfectly functional PCs built before 2018. While users can install Windows 11 on unsupported hardware via workarounds, Microsoft does not guarantee updates or support for these machines. This has created a bifurcated lifecycle: windows 11 lifecycle