NateJacobs

Expires a user’s access to a site after a specified number of days. It uses the user registered date/time and an admin configured number of days to determine when to expire the users access. The administrator can restore a user’s access from the user’s profile page.
There is a filter available for developers to hook into and alter the expiration date of a specific user on the fly during authentication. The filter uae_expiration_date passes the current expiration date and the WP_User object.

User Access Expiration

A user's access to a site is disabled after a specified number of days. The admin can set the number of days since registration to deny access.

Marco Alluvion

The Media Expirator plugin allows users to set expiration dates for media library items. When the date is reached, the file will be automatically delete from the media library.
User can enable/disable expiration date for each media items directly in media editor.
This plugin is translatable.
<h3>Note</h3>
How to: 
Enable/Disable and set an expiration date for each items directly in WordPress media editor.
Goals: 
√ add enable/disable option 
√ plugin translatable 
√ add translations 
• create option page 
• enable time 
• time zone option 
• media types option 
• optimize code 
• ..add other ideas

Media Expirator

It works!

Media Expirator plugin allows users to set expiration dates for media library items.

User Access Expiration vs Media Expirator