While loops in Java-

import java.io.Console;

public class TreeStory {

    public static void main(String[] args) {
        Console console = System.console();
        /*  Some terms:
            noun - Person, place or thing
            verb - An action
            adjective - A description used to                 modify or describe a noun
            Enter your amazing code here!
        */
        // __Name__ is a __adjective__ noun__.                They are always __adverb__ __verb__.
      String ageAsString = console.readLine ("How old are you?  ");
      int age = Integer.parseInt(ageAsString); 
      if (age < 13) {
        //Insert exit code
        console.printf ("Sorry, you must be at least 13 years old to use this program.\n");
        System.exit(0); 
      }

     String name = console.readLine ("Enter a name:  ");
     String adjective = console.readLine ("Enter an adjective:  "); 
     String noun; 
    // words that are not allowed
     boolean isInvalidWord;  
      do {
         noun = console.readLine ("Enter an noun:  ");
         isInvalidWord = (noun.equalsIgnoreCase("dork")||
                          noun.equalsIgnoreCase ("jerk")||
                          noun.equalsIgnoreCase ("nerd"));
    // the word "nerd" seems to be failing the validation
         if  (isInvalidWord){
          console.printf("That language is not allowed. Try again! \n\n");
         } 
      } while (isInvalidWord);
     String adverb = console.readLine ("Enter an adjective:  ");
     String verb = console.readLine ("Enter a verb ending in -ing:  "); 

      console.printf ("Your TreeStory:\n---------\n");
      console.printf ("%s is a %s %s.  ", name, adjective, noun); 
      console.printf ("They are always %s %s. \n", adverb, verb);
    }

}