How to get maxPwdAge for by Organization Unit or Group wise in active directory

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C#

C#4.0

active-directory

I have the requirement like below.

I want to get maxPwdAge value for specific Organization Unit or Group wise.Anybody help me how to do it.

I am able to get domain level maxPwdAge like below

 long maxPwdAge=0;
string domain="LDAP://10.10.1.100/OU=Dev,DC=test,DC=com";
string adsiUserName="test";
string adsiPassword="test";
 DirectoryEntry entry = new DirectoryEntry(domain, adsiUserName, adsiPassword,                 AuthenticationTypes.Secure);
       DirectorySearcher mySearcher = new DirectorySearcher(entry);
       string filter = "(maxPwdAge=*)"; //"maxPwdAge=*";
       mySearcher.Filter = filter;
       SearchResult results = mySearcher.FindOne();
       if (results != null)
       {
           Int64 pwdAge = (Int64)results.Properties["maxPwdAge"][0];
           maxPwdAge = pwdAge / -864000000000;
       }

How to get maxPwdAge for OU or group.

Thanks in advance.