Remove Old Revisions is the new WordPress plugin that automatically removes deletes revisions older than given number of days in your WordPress site. The plugin allows you to automatically remove revisions which are older than the given number of days or you can leave it to blank or 0 to disable the old revision check.
Installation & Usage: Install and activate Remove Old Revision plugin. After activation visit your admin area Dashboard -> Settings -> Writing admin page, scroll down to the section ‘Remove Revions’ and type the number of days.