content: import java.io.*;
  import java.util.*;
  
  public class Person {
      private int age;
  
      public Person(int initialAge) {
          this.age = initialAge;
      }
  
      public void amIOld() {
          // Write code determining if this person's age is old and print the correct statement:
          if (this.age < 0) {
              System.out.println("Age is not valid, setting age to 0.");
              this.age = 0;
              amIOld();
          } else if (this.age < 13) {
              System.out.println("You are young.");
          } else if (this.age >= 13 && this.age < 18) {
              System.out.println("You are a teenager.");
          } else {
              System.out.println("You are old.");
          }
      }
  
      public void yearPasses() {
          this.age += 1;
      }
  
      public static void main(String[] args) {
          Scanner sc = new Scanner(System.in);
          int T = sc.nextInt();
          for (int i = 0; i < T; i++) {
              int age = sc.nextInt();
              Person p = new Person(age);
              p.amIOld();
              for (int j = 0; j < 3; j++) {
                  p.yearPasses();
              }
              p.amIOld();
              System.out.println();
          }
          sc.close();
      }
  }
  