Oracle User Password Never Expired

As development demands, we would like to turn off Orace User Password Never Expired function.

Check the current profile's password life time:
SQL> select * from dba_profiles where profile='PROFILE' and RESOURCE_NAME='PASSWORD_LIFE_TIME';

we need to change the limit of password_life_time parameter to unlimited.
SQL> alter profile PROFILE limit PASSWORD_LIFE_TIME unlimited;  

then all the users' password will never be expired.