The Open Recents sub-menu is a first in, last out replacement stack that you can configure how many recents appear in that sub-menu. Before you embark on the second paragraph, save your open document and quit Pages.
In macOS Ventura Settings > Desktop & Dock, there is a selector for Recent documents, applications, and servers. The extremes are None, or 50 as the Max. On macOS Monterey and earlier, the same configuration setting is in System Preferences > General.
Pages documents that are removed from the system remain in the Recents stack until they are replaced by newer
entries.
If you open a Terminal window and in its search field, you enter the following syntax, it will find Pages documents prior (<), after (>), or between (-) dates. There is one Spotlight date format.
kind:pages created:<01/18/2023
kind:pages created:>01/01/2023
kind:pages created:09/01/2022-01/18/2023
kind:pages font:cormorant
The latter will find any Pages document that included the custom installed OpenType Postscript Cormorant Garamond font in it.