text: function Person(initialAge) {
    // Add some more code to run some checks on initialAge
    if (initialAge >= 0) {
      age = initialAge;
    } else {
      age = 0;
      console.log("Age is not valid, setting age to 0.");
    }
    this.amIOld = function() {
      // Do some computations in here and print out the correct statement to the console
      if (age < 13) {
        console.log("You are young.");
      } else if (age >= 13 && age < 18) {
        console.log("You are a teenager.");
      } else {
        console.log("You are old.");
      }
    };
    this.yearPasses = function() {
      // Increment the age of the person in here
      age++;
    };
  }
  