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()