class Person {
      constructor(name, age){
          this.name = name;
          this.age = age;
      }

    tellMyName(){
        console.log(`I am ${this.name}`);
    }
    tellMyAge(){
        console.log(`I am ${this.age} years old`);
  }
}

  const John = new Person('John', 40);
  const Mary = new Person('Mary', 35);

  John.tellMyName();
  John.tellMyAge();

  Mary.tellMyName();
  Mary.tellMyAge();