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

 public class CalcAge {

   public static void main(String [] args) {
     // remember ... months are 0-based : jan=0 feb=1 ...
     System.out.println
       ("1962-11-11 : " + age(1962,10,11));
     System.out.println
       ("1999-12-03 : " + age(1999,11,3));
   }

   private static int age(int y, int m, int d) {
     Calendar cal = new GregorianCalendar(y, m, d);
     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--;
     }
     return res;
   }
}

import java.time.LocalDate;
import java.time.Month;
import java.time.temporal.ChronoUnit;

public class CalcAgejava8 {
   public static void main(String ... strings ) {
      LocalDate start = LocalDate.of(1962, Month.AUGUST, 12);
      LocalDate end = LocalDate.now();
      long years = ChronoUnit.YEARS.between(start, end);
      System.out.println("Age : " + years);
   }
}