from skmultiflow.drift_detection import ADWIN

adwin = ADWIN()
data_stream=[]
data_stream = np.concatenate((original_df['Credit_History_Age'],new_df3['Credit_History_Age']))

# Add stream elements to ADWIN and verify if drift occurred
for i in range(len(data_stream)):
  adwin.add_element(data_stream[i])
  if adwin.detected_change():
  print('Change detected at index {}'.format(i))
  adwin.reset()