题目内容：

Mr. Brown is 70 years old.One day there is something wrong with his left leg(左腿).so he goes to the doctor.The doctor checks Mr.Brown and then he thinks he knows the answer. The doctor says to Mr.Brown."I'm sorry.It is because of the old age.Just have a rest(休息).”Mr.Brown cries,"That's impossible(不可能的)!" The doctor says,"Why do you say it's not because of the old age? You are not a doctor."  Mr.Brown answers,"I'm not a doctor.but I know you’re not right.My right leg(右腿) is fine." "What do you want to say?" says the doctor. "Well, they are the same age! They are both 70 years old."

根据短文内容，判断正(T)误(F).

1.Mr.Brown is 70 years old.

2.There is something wrong with his right leg.

3.The doctor thinks Mr.Brown needs to have a rest.

4.Mr.Brown is a doctor,too.

5.Mr.Brown thinks the doctor is right.