Starting on April 12th, macOS users will begin receiving messages indicating that apps installed on their system are 32-bit, and will require an update. It no longer accepts 32-bit apps for listing on the Mac App Store so it may not be long before it hammers in the final nail. Apple also mentions that macOS High Sierra will be the last version of macOS that'll support 32-bit apps "without compromise".
Apple hasn't been quite that aggressive with the Mac yet, but the warning that the next major macOS version (presumably macOS 10.14) will not run 32-bit apps "without compromise" (like some sort of compatibility mode with limitations) still stands.
Apple is making it clear that 32-bit apps on the Mac are going away and the future will be 64-bit only. "This is done via a one-time alert that appears when you launch a 32-bit app", Apple continued.
Apple Now Informing Mac Users About 32-Bit App Support Ending
The document also includes a new FAQ that addresses concerns like potential data loss and 32-bit app support on macOS High Sierra.
All modern Macs include powerful 64-bit processors, and macOS runs advanced 64-bit apps, which can access dramatically more memory and enable faster system performance. "No" means the app is 32-bit and needs to be updated, while "Yes" means it is 64-bit and will work just fine without further action from the developer.
"[App] is not optimised for your Mac", states the alert message.More news: Chelsea star admits Chelsea much 'change' after 'hurt' of this season
Apple began the transition to 64-bit hardware and software technology for Mac over a decade ago, and is working with developers to transition their apps to 64-bit. One of the items is 64-bit (Intel). However, it is believed that the 32-bit apps won't work as well as they use to before. Presently, the App Store does not accept submissions of 32-bit apps for macOS. Expect Apple to reveal more details about the next version of macOS during this June's Worldwide Developers Conference.
If you're concerned about all this and want to know exactly which apps you're running now deliver 64-bit support, the folks over at AppleMust have made a handy guide to find out.
Nevertheless, one thing is sure, that Apple is serious about phasing out the 32-bit apps soon. In January, Apple mandated that all new apps submitted for review should be 64-bit compatible.More news: New Character From Overkill's The Walking Dead Revealed
If you're using an old Apple Watch app that hasn't been updated in a while, you might run into some problems when watchOS 5 lands (likely sometime this autumn).More news: U.S. and Russian Federation fight at United Nations over Syria chemical weapons attacks