This plugin unset frontpage status on articles, after x days from created, published or last modify date. Based on Dmitry V. Smirnov plugin for Joomla 1.5 (http://www.joomlatune.ru)
Download plugin file
In Joomla administration, set Extensions > Extension manager Install the package by uploading the zip file
Initialize the plugin in Extensions > Plugin Manager Switch this plugin "System - Unpublish frontend item" active and Set up.