Below is the location in Group Policies that controls password settings.
Computer Configuration > Policies > Windows Setting > Security Settings > Account Policies >Password Policy
The policies you can set here are
Password Age (both minimum and maximum)
Require Complexity (Min of six characters, can't contain user's account name or full name, and any 3 of the following: one capital letter, one lower case letter, a number, and a non-alphabetical character (for example, !, $, #, %))
If you want to change the default change password notification from 14 days, you can find it here:
Computer Configuration > Policies > Windows Setting > Security Settings > Local Policies > Security Options > Interactive logon: Prompt user to change password before expirationI have changed it from 14 day to 7 days.