brendannee

Keep your site’s content fresh. This plugin adds a box to the WordPress admin dashboard that lists all pages that haven’t been updated in recently. Every time you log in you’ll be able to quickly see which pages might need review to ensure the content is still correct and everything is up to date.
You can set the threshold in days for considering a page “old”, the default is 90 days.

Old Page Reminder

This plugin adds a box to the Wordpress admin dashboard that lists all pages that haven't been updated in 90 days.

Pratik Panchal

Admin Notebook is simply allow wordpress site admin to add notes. 
Your added Note will save automatically & Display on Front & admin side all pages when you Logged in.Its resizable & Movable to any where in active Screen.

Admin Notebook

New Admin Notebook is simply allow wordpress site admin to add notes.

Old Page Reminder vs Admin Notebook