How can i update a field using a function

Hi i'm a new developer using CakePHP.
I would like to know
How can i update a field using a function.
Example is

UPDATE Users SET AGE=AGE+2+3+4 WHERE id=1???

Currently i do have a code like this one.

$this->User->id = $user['User']['id'];
$this->User->saveField('count_login', 'count_login+1');
$this->User->saveField('last_login', date('Y-m-d H:i:s'));

Thanks.

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