This is how long Macs and MacBooks last.

This means Apple will currently provide support for these versions of macOS: macOS Ventura (macOS 13, fave.co/3zodJIl), Monterey (macOS 12), and macOS Big Sur (macOS 11). Apple usually maintains the last three versions of the macOS with bug fixes and important security updates, ensuring that the latest version of Safari will run, and that Apple Services, such as iCloud, are fully supported. However, if your Mac is running an older version of the operating system - macOS Catalina (10.15) or earlier - you may find yourself out in the cold when it comes to essential updates to Apple's software. Vintage means Apple may have the parts available if you want to fix the Mac, but once a Mac is what Apple considers Obsolete, the company will not provide parts to fix it. [Extracted from the article]