creating database with c++

#include <iostream>
#include <cstdlib>
using namespace std;
typedef struct Person{
double age;
double height;
Person *next;
}  PERSON;
void display_list (PERSON *start);
void create_person(PERSON *p);
void add_to_list(PERSON *start);
int main()
{
   PERSON *p1 =new PERSON;
   PERSON *p2 =new PERSON;
   PERSON *p3 = new PERSON;

p1 -> age=22;
p1 -> height =180;
p2 -> age =25;
p2 -> height =170;
p3 -> age = 33;
p3 -> height = 168;

p1->next = p2;
p2-> next =p3;
p3-> next = NULL;

display_list(p1);
for(int i=0; i<=100; i++) add_to_list(p1);
cout<< endl;
display_list(p1);
    return 0;
}
void add_to_list(PERSON *start){
PERSON *p0 =start;
while(1){
    if(p0->next== NULL) break;
    p0=p0->next;
}
    PERSON *newperson =new PERSON;
    create_person(newperson);
    p0->next =newperson;
    newperson->next= NULL;

}



void create_person(PERSON *p){
p->age = rand()%21+80;
p->height=rand()%50+150;
}


void display_list (PERSON *start){
PERSON *p0=start;
while(1){
    cout<< " age " << p0-> age << "height " << p0->height<< endl;
    if (p0->next == NULL) break;
    p0=p0->next;
}
}