There has been some confusion about the status of 32-bit apps in macOS 10.14 Mojave, which will be available soon (for free).
What’s a 32-bit App?
I’ve got advice for you on handling the upcoming transition from 32-to-64-bit apps… But first, if you don’t already know what a “32-bit app” is, or why it might matter, here’s a brief excerpt from a relevant Apple tech note*:
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. The technologies that define today’s Mac experience—such as Metal graphics acceleration—work only with 64-bit apps. To ensure that the apps you purchase are as advanced as the Mac you run them on, all future Mac software will eventually be required to be 64-bit.
Read more at the Mac Observer