안녕하세요 c++을 이제 막 배우기 시작했습니다

You will be writing a program that prints out your name and age to stdout. TODO:

create a variable to hold your age
create a variable to hold your name
initialize the values of these two variables
write a main function that prints: "Hello world! My name is your_name and I am your_age years old." with a newline at the end where your_name and your_age are the values of your name and age variables.
Text is stored in a string type in C++. We haven't gone over that in class yet, but a quick Google search should enlighten you how to use it.

이런 정말 간단한 코드를 짜려고 하는데요,

#include <iostream>
#include <string>
using namespace std;

int your_age = 25;
string your_name = "Jason";
cout << "Hello World! My name is " << your_name << "and I am " your_age << "years old." << endl;
이런식으로 했더니 'cout does not have a name type'이런식으로 에러가 뜨더라구요.. 그런데 using namespace std 하면서 된것 아닌가요??

또 한가지
#include <iostream>
#include <string>
using namespace std;

int your_age;
your_age = 25;
string your_name;
your_name = "Jason";
cout << "Hello World! My name is " << your_name << "and I am " your_age << "years old." << endl;

이런식으로 했을때는 윗 에러에 추가해서 your_age 와 your_name 가 initializer 가 필요하다고 나오는데 왜그런지 모르겠어요 ㅜㅜ

미리 감사드립니다 -- __