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();