回答編集履歴

  bins = np.arange(11)

  labels = [f"10歳未満" if x == 0 else f"{x}0代" for x in range(10)]

  freq, bins = np.histogram(dfs['患者_年代'], range=(0, 90))

  x = np.arange(len(bins) - 1)

 

  fig, ax = plt.subplots()