Assignemnt #49 and Gender Game

Code

      ///Name: Dakota Donahue
      ///Period: 5
      ///Project Name:Gender Game
      ///File Name:GenderGame
      ///Date: 11/5/2015
      import java.util.Scanner;

      public class GenderGame
      {
          public static void main( String[] args )
          {
              Scanner keyboard = new Scanner(System.in);
              
              String gD, fN, lN, mD;
              int age;
              
              System.out.println( " Are you male or female (M/F) ");
              gD = keyboard.next();
              
              System.out.println( " First Name: ");
              fN = keyboard.next();
              
              System.out.println( " Last Name: ");
              lN = keyboard.next();
              
              System.out.println(" Age: ");
              age = keyboard.nextInt();
              
              if ( age >= 20 )
              {
              System.out.println("\n Are you married? (Y/N) \n" );
              mD = keyboard.next();
                  if ( mD.equals("Y") )
                  {
                      if ( gD.equals("M") )
                      {
                          System.out.println( "Then I shall call you Mr. " + lN + ". " );
                      }
                      else if ( gD.equals("F") )
                      {
                          System.out.println( "Then I shall call you Mrs. " + lN + ". " );
                      }
                  }
                  else if ( mD.equals("N") )
                  {
                      if ( gD.equals("M") )
                      {
                          System.out.println( "Then I shall call you Mr. " + lN + ". " );
                      }
                      else if ( gD.equals("F") )
                      {
                          System.out.println( "Then I shall call you Ms. " + lN + ". " );
                      }
                  }
              }
              else if ( age <= 20 )
              {
                  if ( gD.equals("M") )
                  {
                      System.out.println( "Then I shall call you " + fN + " " + lN + ". " );
                  }
                  else if ( gD.equals("F") )
                  {
                      System.out.println( "Then I shall call you " + fN + " " + lN + ". " );
                  }
              }
          }
      }