poo.js

class Person {
    constructor(name, age) {
        this.name = name;
        this.age = age;
    }
    tellMyName() {
        return `I am ${this.name}`;    
    }
    tellMyAge() {
        return `I am ${this.age} years old`;        
    }
}

const john = new Person('John', 40);
console.log(john.tellMyName());
console.log(john.tellMyAge());

const mary = new Person('Mary', 35);
console.log(mary.tellMyName());
console.log(mary.tellMyAge());