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

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