关于python：在赋值之前引用的局部变量“age”

Local Variable “age” referenced before assignment

我最近开始学Python。我正在解决一个问题。

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class Person:
age = 0
def __init__(self,initial_Age):
if initial_Age<0:
age=0
print("This person is not valid, setting age to 0.")
else:
age = initial_Age

def amIOld(self):
if(age<13):
print("You are young.")
elif(age>=13 and age<18):
print("You are a teenager.")
else:
print("You are old.")
def yearPasses(self):
age = age + 1
T=int(input())
for i in range(0,T):
age=int(input())
p=Person(age)
p.amIOld()
for j in range(0,3):
p.yearPasses();
p.amIOld();
print ("")

我得到的错误显示在下面：

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Traceback (most recent call last):
File"solution.py", line 27, in <module>
p.yearPasses();
File"solution.py", line 19, in yearPasses
age = age + 1
UnboundLocalError: local variable 'age' referenced before assignment

输入如下：

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5

4(Number of test cases)
-1
10
16
18

输出必须是这样的：

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This person is not valid, setting age to 0.
You are young.
You are young.

You are young.
You are a teenager.

You are a teenager.
You are old.

You are old.
You are old.

你能告诉我我做错了什么吗？谢谢