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 person1 = new Person("John", 40);
const person2 = new Person("Mary", 35);

person1.tellMyName();
person1.tellMyAge();

person2.tellMyName();
person2.tellMyAge();