Java Data Type - 如何添加60到你的年龄

import java.text.SimpleDateFormat;
import java.util.Calendar;

public class Main {

    public static void main(String... args){

        SimpleDateFormat df = new SimpleDateFormat("MM/dd/YYYY");

        Calendar c = Calendar.getInstance();
        System.out.println(df.format(c.getTime()));

        c.add(Calendar.YEAR, 60);
        System.out.println(df.format(c.getTime())); 
    }
}