':return: Pretty string representing age of episode. eg "23d 12h" or "No releases seen"'

@property
def age(self):

    if (not self.first_seen):
        return u'No    releases    seen'
    diff = (datetime.now() - self.first_seen)
    age_days = diff.days
    age_hours = ((diff.seconds // 60) // 60)
    age = u''
    if age_days:
        age += (u'%sd    ' % age_days)
    age += (u'%sh' % age_hours)
    return age
