Password Policies?

Hi guys, Having just come from a meeting, I've not actually had a chance to do any research myself, and hoped to lean on the community a little. A concern was put forward regarding password policies for policies stored in a radius server. Now, policies like "Must be 8 characters" and "must have 2 numbers" can be handled easily enough in form processing on some sort of front end, however, is it possible have a radius password expire after a set period of time, and then send back a specific message saying that the password has expired? (ie one month?) Many Thanks, Justin Steward