How to change the oracle db password life-time

On our oracle 11 installation, the password life-time would end today, which is printed on logging into the database with sqlplus.

On a stackoverflow.com discussion, I found the hint's, to change the lifetime of an oracle user password.

log in to the database:

sqlpuls system/system
lookup the profile to which your user belongs to:

select profile from DBA_USERS where username = <username>

change the profile for your user: 

alter profile limit password_life_time UNLIMITED;

To view your change: 
select resource_name,limit from dba_profiles where profile='';