This is also true to users of macOS Big Sur or Monterey, who may experience an error saying 'app needs to be updated'. If you run 32-bit app on macOS High Sierra, you would constantly receive the warnning to let you update apps or optimize apps to improve compatibility.
At 2018 WWDC, Apple officially announced that macOS Mojave is the last version of maOS to support 32-bit apps.
