We are surprised that Apple has not updated the Mac app icons and is therefore compatible with iOS versions. It’s something we think will eventually happen with the launch of Big Sur (because Apple will update its icon design to have a more integrated Document).
New versions can be downloaded from the links below:
The system requirements to download new page types, numbers, and Keynote are iOS 13.1 and MacOS Mojave (10.14)
Pages, Numbers, and Keynote are Apple's equivalent of Word, Excel, and PowerPoint. All three apps are free on macOS, iOS, and iPadOS. Another free option is OpenOffice.