docs: def ListChildren(self, limit=None, age=NEWEST_TIME):
      """Yields RDFURNs of all the children of this object.
  
      Args:
        limit: Total number of items we will attempt to retrieve.
        age: The age of the items to retrieve. Should be one of ALL_TIMES,
          NEWEST_TIME or a range in microseconds.
  
      Yields:
        RDFURNs instances of each child.
      """
      # Just grab all the children from the index.
      for predicate, timestamp in data_store.DB.AFF4FetchChildren(
          self.urn, timestamp=Factory.ParseAgeSpecification(age), limit=limit):
        urn = self.urn.Add(predicate)
        urn.age = rdfvalue.RDFDatetime(timestamp)
        yield urn