Kiril Apostolov shows no sign of being short of breath as he climbs a steep street in the mountain village of Skrat in southwestern Bulgaria, medical briefcase in hand, despite his advanced age.Apostolov turned 90 in May, but still scales the same hill almost every day to visit his patients at the f

Doctor Kiril Apostolov shows no sign of being short of breath as he climbs a steep street in the mountain village of Skrat in southwestern Bulgaria, medical briefcase in hand,…

Doctor Kiril Apostolov shows no sign of being short of breath as he climbs a steep street in the mountain village of Skrat in southwestern Bulgaria,...

Kiril Apostolov shows no sign of being short of breath as he climbs a steep street in the mountain village of Skrat in southwestern Bulgaria, medical briefcase in hand, despite…