class Person {
  #age = 0;

  constructor(name, age) {
    this.name = name;
    this.#age = age;

    Object.defineProperty(this, 'name', { enumerable: false });
    Object.defineProperties(this, {
      name: {
        enumerable: false,
      },
      age: {
        enumerable: true,
      },
    });
  }

  get age() {
    return this.#age;
  }
}

const xfy = new Person('xfy', 18);
console.log(xfy.name);
console.log(xfy.age);
console.log(xfy);