How to Setup Windows Maximum Password Age

By default, this setting is defined in the Default Domain Group Policy object (GPO) and in the local security policy of workstations and servers with a value of 42.

To setup maximum password age, open the Group Policy by running gpedit.msc or mmc. Expand Local Computer Policy\Computer Configuration\Windows Settings\Security Settings\Account Policies\Password Policy

You can set passwords to expire after a number of days between 1 and 999. If  you want passwords never expire,  set the number of days to 0.