Requiring Assistance

Question

/* Session6B07.java */
/* Evaluates compatibility for a dating agency */
import java.util.*;
public class Session6B07
  public static void main(String[] args)
  /* Description  ......
     Prompt for and read both ages
     IF both ages are valid
        Display valid message
        IF female is the eldest
           Compatibility is 1
        ELSE IF male is the eldest
          Compatibility is 2
        ELSE (same age)
           Compatibility is 3
        Display the compatibility
     ELSE (invalid ages)
        Display invalid message
/* variables for male age, female age & compatibility */
     int male_age,
          female_age;
     Scanner data_input = new Scanner(System.in);
      System.out.printf("Enter male age and then female age: ");
      male_age = data_input.nextInt();
      female_age = data_input.nextInt();
      if (male_age >= 18 && male_age <= 65) && (female_age >= 18 && female_age <= 65)
            System.out.printf ("Ages are valid%n");
             if (female_age >= male_age)
                 System.out.printf("Compatibility is 1");
                 else if (male_age >= female_age)
                     System.out.printf("Compatibility is 2");
             else (male_age == female_age)
                 System.out.printf("Compatibility is 3");
     else
            System.out.printf("Ages are invalid%n");
}When compiling I receive the following errors:
M:\>javac Session6B07.java
Session6B07.java:33: illegal start of expression
         if (male_age >= 18 && male_age <= 65) && (female
e <= 65)
                                               ^
Session6B07.java:33: ';' expected
         if (male_age >= 18 && male_age <= 65) && (female
e <= 65)
        ^
Session6B07.java:42: not a statement
                   else (male_age == female_age)
                        ^
Session6B07.java:45: 'else' without 'if'
     else
     ^
Session6B07.java:46: <identifier> expected
               System.out.printf("Ages are invalid%n");
                                ^
Session6B07.java:46: illegal start of type
               System.out.printf("Ages are invalid%n");
                                 ^
Session6B07.java:51: class, interface, or enum expected
^
7 errorsI would appreciate any help, thanks in advance.

Answer 1

Following dnb's advice all the errors have been removed, but the program doesn't function how it should do, which is quite odd.
Here's an update:
/* Session6B07.java */
/* Evaluates compatibility for a dating agency */
import java.util.*;
public class Session6B07
  public static void main(String[] args)
  /* Description  ......
     Prompt for and read both ages
     IF both ages are valid
        Display valid message
        IF female is the eldest
           Compatibility is 1
        ELSE IF male is the eldest
          Compatibility is 2
        ELSE (same age)
           Compatibility is 3
        Display the compatibility
     ELSE (invalid ages)
        Display invalid message
/* variables for male age, female age & compatibility */
     int male_age,
          female_age;
     Scanner data_input = new Scanner(System.in);
      System.out.printf("Enter male age and then female age: ");
      male_age = data_input.nextInt();
      female_age = data_input.nextInt();
      if ((male_age >= 18 && male_age <= 65) && (female_age >= 18 && female_age <= 65))
            System.out.printf ("Ages are valid%n");
             if (female_age >= male_age)
                 System.out.printf("Compatibility is 1");
                 else if (male_age >= female_age)
                     System.out.printf("Compatibility is 2");
                 else if (male_age == female_age)
                 System.out.printf("Compatibility is 3");
     else
            System.out.printf("Ages are invalid%n");
}