code: def is_good_age_ratios(self):
          
          ratios = self.age_ratios()
  
          if None in ratios:
              # If there is None, just check to not exceeding 1
              clean_ratios = [x for x in ratios if x is not None]
              ratios.remove(None)
              if sum(clean_ratios) > 1:
                  return False
          else:
              if sum(ratios) != 1:
                  return False
  
          return True
docs: Method to check the sum of age ratio is 1.
  
          :returns: True if the sum is 1 or the sum less than 1 but there is
              None.
          :rtype: bool