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();