Java でカスタム反復可能オブジェクトを実装するにはどうすればよいでしょうか?

public interface Iterable<T>

import static java.lang.String.format;
import java.util.*;
// Person class
class Person {
   private String firstName, lastName;
   private int age;
   public Person(){ }
   public Person(String firstName, String lastName, int age) {
      this.firstName = firstName;
      this.lastName = lastName;
      this.age = age;
   }
   public String getFirstName() {
      return firstName;
   }
   public String getLastName() {
      return lastName;
   }
   public int getAge() {
      return age;
   }
   public void setFirstName(String firstName) {
      this.firstName = firstName;
   }
   public void setLastName(String lastName) {
      this.lastName = lastName;
   }
   public void setAge(int age) {
      this.age = age;
   }
   @Override
   public String toString() {
      return format("First Name:\t%s\tLast Name:\t%s\tAge:\t%d", firstName, lastName, age);
   }
}
// PersonArrayList class
public class PersonArrayList implements Iterable<Person> {
   private List<Person> persons;
   private static final int MIN_AGE = 10;
   public PersonArrayList() {
      persons = new ArrayList<Person>(MIN_AGE);
   }
   public PersonArrayList(int age) {
      persons = new ArrayList<strong><Person></strong>(age);
   }
   public void addPerson(Person p) {
      persons.add(p);
   }
   public void removePerson(Person p) {
      persons.remove(p);
   }
   public int age() {
      return persons.size();
   }
   @Override
   public Iterator<Person> iterator() {
      return persons.iterator();
   }
   public static void main(String[] args) {
      Person p1 = new Person("Adithya", "Sai", 20);
      Person p2 = new Person("Jai","Dev", 30);
      PersonArrayList pList = new PersonArrayList();
      pList.addPerson(p1);
      pList.addPerson(p2);
      for (Person person : pList) {
         System.out.println(person);
      }
   }
}

First Name:  Adithya   Last Name:   Sai   Age:   20
First Name:  Jai       Last Name:   Dev   Age:   30