With this plugin you can set a time validity for the passwords of your registered users. For example, if you set 30 days, every registered user can navigate in the website for 30 days from his last password reset (or from his register date). After 30 days the plugin redirect the user to the password reset page. User cannot navigate to other pages until he change his password.

Main features:

• Easy installation and configuration.
• Unlimited days can be set for password validity.
• Redirect to Joomla core or Community Builder profile edit page.
• Exclusions: you can exclude one or more user groups from the expiration of their passwords (such as Admins or Super Users).
• No new tables created in your DB.

Read more http://feeds.joomla.org/~r/JoomlaExtensions/~3/_hf9K0nBOrE/force-password-reset