Jan Štětina

Hides posts older than given date or amount of time relative to present (see <code>(http://php.net/manual/en/function.strtotime.php strtotime)</code>).
You can also choose a capability – users who have this capability will then see all posts. And if you enter <code>none</code>, even admins will be excluded.
Uses <code>posts_where</code> and <code>getarchives_where</code> filters.
Developed for private use, but has perspective for more extensive usage. I can’t guarantee any support in the future nor further development, but it is to be expected. Kindly inform me about bugs, if you find any, or propose new features: zaantar@zaantar.eu.

Hide Old Posts

Hides posts older than given amount of time.

Chris Reynolds

The purpose of this plugin is to shame content editors into updating page content that has not been touched in a long time, while simultaneously providing an overview of the oldest pages on a site. Also: gifs.
The plugin adds an Out of Date Pages subpage under the Pages menu, which breaks all the pages on the site down by last modified date, grouped by years since it’s been modified. Each page listed has a link to edit the page. All images on the Out of Date Pages subpage are sourced from <a href="http://reactiongifs.com" rel="nofollow ugc">reactiongifs.com</a>.

Update Shaming

The only WordPress plugin not afraid to give you dirty looks.

Hide Old Posts vs Update Shaming