Why would you want to do that? Passwords should expire if the users aren't using them. Quite often the person has left and no one bothers to tell the system administrator. I do send out warnings that your password is about to expire, but if they either aren't around or are too lazy, then the password will expire and they will have to ask to get it reset.

If your management is telling you to do this, then tell them this is bad computer security.