For the security purposes most of large sites specially bank websites, government sites force there users to change their password regularly. Being a system administrator I also recommend to enable password expiration for your websites, servers or applications. This tutorial will help you to enable password expiration in your WordPress website.
1. Install Required Plugin
Login to your WordPress admin control panel and install WP Password Policy Manager plugin to your WordPress site.
2. Configure Password Policy
After successful installation of plugin navigate to Settings >> Password Policies . You will get screen like below screenshot. Configure policies as per your requirements.
All the options are self descriptive, so anyone can easily configure it. Set the number of days for password expiration. Also you can specify the password strength on basis of minimum length, uses of numbers and symbols. Also you can enable to remembers last passwords, so that users can’t use old passwords.
The plugin no longer exists. Know of any other free plugin?