Oracle Password Expire set unlimited

I am getting password expire each 4 5 months, I wan to set to unlimited


SQL> connect sqlplus"/as sysdba"


SQL> alter user system account unlock ;

Next, change the profile limit to unlimited.

SQL> alter profile DEFAULT limit PASSWORD_REUSE_TIME unlimited;

SQL> alter profile DEFAULT limit PASSWORD_LIFE_TIME  unlimited;

Check the password expiry date 

 
SQL> select username, account_status, EXPIRY_DATE from dba_users where username='BURLESON'; 
USERNAME                       ACCOUNT_STATUS               EXPIRY_DATE
------------------------------ ---------------------------- ---------
BACMONIT                       OPEN                         UNLIMITED

Thanks

Yoonus