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);

const mary = new Person ("Marie", 35);

console.log(john.tellMyName() + john.tellMyAge());
console.log(mary.tellMyName() + mary.tellMyAge());