Frank Bueltge

Bernhard Kau

Torsten Landsiedel

ChriCo

Caspar Hübinger

Sergej Müller

This simple WordPress plugin displays a message in any single post that has been published x years ago from the current time or earlier. The default time to count back is 1 year. Minimal post age as well as message text, HTML, and CSS are <a href="//wordpress.org/plugins/aged-content-message/faq/" rel="nofollow ugc">fully customizable via settings</a>.
<h4>Languages</h4>
<ul>
<li>English (en_US) (default)</li>
<li>German (de_DE)</li>
<li>Formal German (de_DE_formal)</li>
</ul>

Aged Content Message

This is great little helper! :)

The settings are easy and it does nothing without you configuring it.

If you need more customizations, then you can use filters to further prevent or show the message.

You can style it yourself if you know CSS, but it ships with a generic CSS styling which works in most cases.

Recommended little plugin with a responsive author and a Github repo for issues or PRs. 

Open source can be fun with such great little helper plugins. This is the reason why this directory exists.

Hopefully the "[Discontinued]" text on the Github repo is a mistake ... 

Great little helper - very customizable

Displays a message at the top of single posts published x years ago or earlier, informing about content that may be outdated.

Valice

Banner alerts are custom alerts to notify your website visitors of promotions, alerts, events, etc. These display at the top of the website until they are dismissed by the visitor. Any new visitor who has not been to the website will see these until they are dismissed.
Banner alerts are configured just like a post or page with support for title, content, and excerpt. The plugin settings allow you to define which parts of the alert to display and whether or not to link to the full post. You can run more than one alert at a time and activate or deactivate as needed.
This plugin is ideal for:
<ul>
<li>Important operational changes</li>
<li>Technical notices</li>
<li>Time-sensitive appeals for donation or action</li>
<li>Terms or agreement changes</li>
<li>Privacy notice acknowledgements</li>
<li>Service outages or maintenance messages</li>
<li>Special offers or promotions</li>
</ul>

Banner Alerts

Provides an easy interface for creating and displaying alerts or notices as a banner on a website

Aged Content Message vs Banner Alerts