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`);
    }
}

let John = new Person ('John', 40);
John.tellMyName();
John.tellMyAge();

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