Mark Old WordPress Posts With a Notification
If you’ve been blogging for a number of years, then you know that sometimes a visitor to your blog can be confused by a post with older information. However, you may want to keep the posts as they are for a record, instead of constantly updating them with new information. In that case, you should consider using the Old Post Notification plugin. This allows you to mark a post as old in the post editor and add a short notification.
The notification will appear at the top of the post and the placement and styling can be customized through filters, as detailed in the plugin’s description.
I tested this plugin and it works just as advertised. If you’ve got old posts, install the free Old Post Notification plugin to keep your visitors informed.