C - Pointer For List

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define N 20

struct data{
    int age;
    struct data *nextAge;
};

int main()
{
    system("color 2f");

    struct data zero, satu, dua, tiga;
    zero.age = 24;
    satu.age = 27;
    dua.age = 32;
    tiga.age = 55;

    struct data* next, *current;

    zero.nextAge = &satu;
    satu.nextAge = &dua;
    dua.nextAge = &satu;
    tiga.nextAge = NULL;

    current = zero.nextAge;

    int i;
    for(i=0; i< 3; i++){
        printf("%d\n", (current-i)->age);
    }


    return 0;
}

C - Pointer For List