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

    tellMyName() {
        return console.log(`I am ${this.name}`);
    }

    tellMyAge() {
        return 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();