Let see, you have a few questions here. Let me see what we can do. In order to force the use of strong passwords, you will likely want to use Pluggable Authentication Manager (PAM).
As for password aging, you can use the change command or make use of the GUI User Manager tools.
For a more detailed reference on how to perform these task I would suggest looking at:
http://www.redhat.com/docs/manuals/l...tion-pass.html
Happy Hunting!