https://www.chron.com/business/article/Will-Mojave-macOS-10-14-Support-32-bit-Apps-13219410.php

There has been some confusion about the status of 32-bit apps in macOS 10.14 Mojave, which will be available soon (for free).

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: