Hi, I am new to c programming. Could anyone please tell me what's wrong with the following program?

typedef struct Person_s
{
  int age;
  char name[40];
} Person_t;


int process_list(int *countReturned, Person_t **p_list)
{

  Person_t *rowPtr=0;
  //the actual program will fethc data from DB

  int count =1;

 if(!((*p_list) = (Person_t *) malloc(sizeof(Person_t))))
 {
    return -1;
 }

 rowPtr = *p_list;

 rowPtr[count-1].age =19;
 strcpy(rowPtr[count-1].name,"Prince Dastan");
 *countReturned = count;

  return 0;
}


int main(int argc, char *argv[])
{
        Person_t *tmpPerson=0;
        Person_t **p_list=0;
        int *count=0;
        int i;

        process_list(count,p_list);

        tmpPerson = *p_list;

        for(i=0; i< *count; i++)
        {
           printf("Name: %s , age: %d\n",tmpPerson->name,tmpPerson->age);
           tmpPerson++;
        }

        //free(tmpPerson);

  return 0;
}