Not called default constructor and copy constructor (and maybe other logical errors)

#include <iostream>
#define MAX 10

using namespace std;

class Person
{


  private:
    char *name;
    char *surname;
    double age;

  public:

    Person(): name(NULL), surname(NULL), age(0.0L)
    {
        cout << "default costructor activated\n";
    }
    Person(char *n, char *sn, double ag): name(n), surname(sn), age(ag)
    {
        cout << "normal costructor activated\n";
    }
    Person(const Person &p)
    {

        if (name != NULL)
        {
            delete name;
            name = NULL;
        }

        if (surname != NULL)
        {
            delete surname;
            surname = NULL;
        }



        name = new char[strlen(p.name) + 1];
        strcpy(name, p.name);

        surname = new char[strlen(p.surname) + 1];
        strcpy(surname, p.surname);

        age = p.age;

        cout << "copy costructor activated\n";
    }


    ~Person()
    {

        if (name != NULL)
        {
            delete name;
            name = NULL;
        }

        if (surname != NULL)
        {
            delete surname;
            surname = NULL;
        }

        age = 0.0L;
        cout << "destructor costructor activated\n";
    }


    void display(void);

    void setName(char*);
    void setSurname(char*);
    void setAge(double);

    Person *operator = (Person*);

    friend int calculateBirthYear(Person &);
};


Person *Person::operator = (Person *p) //implementation of assignment operator
{

  if (name != NULL)
  {
    delete name;
    name = NULL;
  }

  if (surname != NULL)
  {
    delete surname;
    surname = NULL;
  }



  name = new char[strlen(p->name) + 1];
  strcpy(name, p->name);

  surname = new char[strlen(p->surname) + 1];
  strcpy(surname, p->surname);

  age = p->age;
  cout << "Assigment operator activated\n";

  return this;


}

void Person::setName(char *onoma) //onoma mean name
{
  if (name != NULL)
  {
    delete name;
    name = NULL;
  }

  name = new char[strlen(onoma) + 1];
  strcpy(name, onoma);


}


void Person::setSurname(char *eponumo) //eponumo mean surname
{

  if (surname != NULL)
  {
    delete surname;
    surname = NULL;
  }

  name = new char[strlen(eponumo) + 1];
  strcpy(surname, eponumo);



}


void Person::setAge(double ilikia) //ilikia mean age
{

  age = ilikia;



}


void Person::display()
{

  cout << "name: " << name << "\n";
  cout << "Surname: " << surname << "\n";
  cout << "Age: " << age << "\n";

}



int calculateBirthYear(Person &);

int main(void)
{


  char *onoma = NULL,  *eponumo = NULL;
  double age = 0.0L;
  int BirthYear = 0;
  onoma = new char[50];
  eponumo = new char[50];
  short data = 2, raise = 2;

  Person **p = new Person *[MAX];
  for (int c = 0; c < 10; c++)
    p[c] = NULL;       


  cout << "Enter number of data (max 10, by default 2): ";
  cin >> raise;
  system("cls");

  if (raise > 2 && raise < 11)
    data = raise;

  cout << "\t\t\t Insert Data of " << data << " People \n\n\n";

  for (int i = 0; i < data; i++)
  {

    cout << "\nName: ";
    cin >> onoma;

    cout << "Surname: ";
    cin >> eponumo;

    cout << "Age: ";
    cin >> age;
    cout << "\n\n";

    p[i] = new Person(onoma, eponumo, age);
  }

  system("cls");
  cout << "\t\t\t   People Data\n\n\n";
  for (int i = 0; i < data; i++)
  {

    p[i]->display();
    BirthYear = calculateBirthYear(*p[i]);
    cout << "BirthYear: " << BirthYear;
    cout << "\n\n";
  }


  delete [] p;
  delete [] onoma;
  delete [] eponumo;

  cout << "\n\n\n";
  system("PAUSE");
  return 0;
}


int calculateBirthYear(Person &p)
{

  int currentYear = 2012;
  int birthYear = currentYear - static_cast < int > (p.age);
  return birthYear;


}