Calculate the age

 
import java.util.Calendar;
import java.util.GregorianCalendar;

public class Main {

  public static void main(String[] args) {
    Calendar cal = new GregorianCalendar(1999, 1, 1);
    Calendar now = new GregorianCalendar();
    int res = now.get(Calendar.YEAR) - cal.get(Calendar.YEAR);
    if ((cal.get(Calendar.MONTH) > now.get(Calendar.MONTH))
        || (cal.get(Calendar.MONTH) == now.get(Calendar.MONTH) && cal.get(Calendar.DAY_OF_MONTH) > now
            .get(Calendar.DAY_OF_MONTH))) {
      res--;
    }
    System.out.println(res);
  }
}