age-validator Follow @yiiframework

#method of your model class, that you need to validate
public function rules()
{
    return array(
 
        # If you imported ext.validators.age.EAgeValidator or placed EAgeValidator.php
        # to directory, that is imported (for example, protected/components)
        array('your_birthdate_field_name1', 'EAgeValidator'),
        ...
        # With options and full path to extension   
        array('your_birthdate_field_name2', 'ext.validators.age.EAgeValidator',                    
                  'minAge'=>16, 
                  'maxAge'=>120, 
                  'allowEmpty'=>false
        ),
        ...
    );
}