My program is about age calculation. It is running successfully, but once i get the output its not go to the next, its just come out from the running condition. what will i do for this. I pasted my program below.

import java.util.*;

import java.io.*;

public class AGECALC {
    public static void main(String[] args) throws IOException {
        int day = 1, month = 0, year = 1, ageYears, ageMonths, ageDays;
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        Calendar cd = Calendar.getInstance();
        try {
            System.out.print("Enter year of your date of birth : ");
            year = Integer.parseInt(in.readLine());
            {
                if (year > cd.get(Calendar.YEAR)) {
                    System.out.print("Invalid date of birth.");
                    System.exit(0);
                }
                System.out.print("Enter month of your date of birth : ");
                month = Integer.parseInt(in.readLine());
                if (month < 1 || month > 12) {
                    System.out.print("Please enter month between 1 to 12.");
                    System.exit(0);
                } else {
                    month--;
                    if (year == cd.get(Calendar.YEAR)) {
                        if (month > cd.get(Calendar.MONTH)) {
                            System.out.print("Invalid month!");
                            System.exit(0);
                        }
                    }
                }
                System.out.print("Enter day of your date of birth : ");
                day = Integer.parseInt(in.readLine());
                if (month == 1 || month == 3 || month == 5 || month == 7
                        || month == 8 || month == 10 || month == 12) {
                    if (day > 31 || day < 1) {
                        System.out.print("Please enter day between 1 to 31.");
                        System.exit(0);
                    }
                } else if (month == 4 || month == 6 || month == 9
                        || month == 11) {
                    if (day > 30 || day < 1) {
                        System.out.print("Please enter daybetween 1 to 30.");
                        System.exit(0);
                    }
                } else {
                    if (new GregorianCalendar().isLeapYear(year)) {
                        if (day < 1 || day > 29) {
                            System.out
                                    .print("Please enter day between 1 to 29.");
                            System.exit(0);
                        }
                    } else if (day < 1 || day > 28) {
                        System.out.print("Please enter day between 1 to 28.");
                        System.exit(0);
                    }
                }
                if (year == cd.get(Calendar.YEAR)) {
                    if (month == cd.get(Calendar.MONTH)) {
                        if (day > cd.get(Calendar.DAY_OF_MONTH)) {
                            System.out.print("Invalid date!");
                            System.exit(0);
                        }
                    }
                }
            }
        } catch (NumberFormatException ne) {
            System.out.print(ne.getMessage() + " is not a legal entry!");
            System.out.print("Please enter number.");
            System.exit(0);
        }
        Calendar bd = new GregorianCalendar(year, month, day);
        ageYears = cd.get(Calendar.YEAR) - bd.get(Calendar.YEAR);
        if (cd.before(new GregorianCalendar(cd.get(Calendar.YEAR), month, day))) {
            ageYears--;
            ageMonths = (12 - (bd.get(Calendar.MONTH) + 1))
                    + (bd.get(Calendar.MONTH));
            if (day > cd.get(Calendar.DAY_OF_MONTH)) {
                ageDays = day - cd.get(Calendar.DAY_OF_MONTH);
            } else if (day < cd.get(Calendar.DAY_OF_MONTH)) {
                ageDays = cd.get(Calendar.DAY_OF_MONTH) - day;
            } else {
                ageDays = 0;
            }
        } else if (cd.after(new GregorianCalendar(cd.get(Calendar.YEAR), month,
                day))) {
            ageMonths = (cd.get(Calendar.MONTH) - (bd.get(Calendar.MONTH)));
            if (day > cd.get(Calendar.DAY_OF_MONTH))
                ageDays = day - cd.get(Calendar.DAY_OF_MONTH) - day;
            else if (day < cd.get(Calendar.DAY_OF_MONTH)) {
                ageDays = cd.get(Calendar.DAY_OF_MONTH) - day;
            } else
                ageDays = 0;
        } else {
            ageYears = cd.get(Calendar.YEAR) - bd.get(Calendar.YEAR);
            ageMonths = 0;
            ageDays = 0;
        }
        System.out.print("Age of the person : " + ageYears + " year, "
                + ageMonths + " months and " + ageDays + " days.");
    }

}