Double-click on the document Drag it to the Pages icon in the Dock Use File, Open from within Pages The thing is that each of these can also work if you're trying to open a Microsoft Word document.

Apple has put the Mac versions of Pages, Numbers, and Keynote through some major revisions over the years. Early versions gave way to the “iWork ’09” suite in 2009, a major update and ...

If you turn on the word count for a Pages document on iPhone, the count will display for any other Pages document you open until you turn off the toggle.