class Person{
    constructor(name,age){
        this.name = name;
        this.age = age;
    }
    tellMyName (){
        return  `I am ${this.name}`;
    }
    tellMyAge(){
        return `and I am ${this.age} years old.`;
    }
}
let John = new Person('John', 40);
console.log(John.tellMyName(), John.tellMyAge());

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