from datetime import date  
  
def calculate_age(dtob):  
    today = date.today()  
    return today.year - dtob.year - ((today.month, today.day) < (dtob.month, dtob.day))  
print()  
print(calculate_age(date(2006,10,12)))  
print(calculate_age(date(1989,1,12)))  
print()  