As expected, Apple has confirmed during the WWDC that macOS 10.14 Mojave will be the last version of macOS supporting older 32-bit apps, which on the one hand is good luck for those who still use such apps, but in one and a half years you have to look for alternatives when macOS 10.15 appears. This is still a relatively long time, but some apps are simply not developed anymore, for example, because the manufacturer is no longer on the market.
Apple has been reporting since macOS High Sierra 10.13.4 that 32- Bit applications on Macs will soon stop running. When a 32-bit app opens in High Sierra, users will receive a warning about the future incompatibility with the macOS operating system – but Apple did not mean to say that it’s already over with macOS 10.14.
Also, when opening 32-bit applications in MacOS 10.14 Mojave (Beta 1), a dialog box appears with a similar message. Apple writes: “This application is not compatible with future versions of MacOS”. Clicking on “OK” will still allow the app to start.
Currently the warning is only shown once per app. However, that could change in later beta’s of macOS Mojave, as Apple had previously said that there will be “aggressive” warnings regarding 32-bit applications in the next release of macOS after High Sierra. Apple had previously 32-bit apps on iOS made the end. In iOS 10, Apple had issued urgent warnings about this issue to inform users that their applications will not work with future versions of iOS before 32-bit support with iOS 11 was completely abolished.