增加：1、循環猜，2、最多猜3次，3、超過3次輸出猜次數過多：

age_of_XueKe=18

count=0
while True:
    if count==3:
        break
    age = int(input("age:"))
    if age == age_of_XueKe:
        print("Yes,you got it!")
        break
    elif age >age_of_XueKe:
        print("Think smaller!")
    else:
        print("Think bigger!")
    count=count+1
if count==3:
    print("You have tried too many times...")

優化版：

age_of_XueKe=18

count=0
while count<3:
    age = int(input("age:"))
    if age == age_of_XueKe:
        print("Yes,you got it!")
        break
    elif age >age_of_XueKe:
        print("Think smaller!")
    else:
        print("Think bigger!")
    count=count+1
else:
    print("You have tried too many times...")

用while循環寫猜年齡以及優化版