>I'm a relatively new user and have not been able to find much information about how to make a password 'expire'.
I hate to be the one to say this, but 'man passwd' might be worth looking at.
UPDATE
That is before trying trying anything else.
Ted
--
"That which we persist in doing becomes easier, not that the task itself has become easier, but that our ability to perform it has improved."
--Ralph Waldo Emerson