':return: True if movie details are considered to be expired, ie. need of update'

@property
def expired(self):

    if (self.updated is None):
        log.debug((u'updated    is    None:    %s' % self))
        return True
    refresh_interval = 2
    if self.year:
        age = max((datetime.now().year - self.year), 0)
        refresh_interval += (age * 5)
        log.debug((u'movie    `%s`    age    %i    expires    in    %i    days' % (self.title, age, refresh_interval)))
    return (self.updated < (datetime.now() - timedelta(days=refresh_interval)))
