Assigning a string to a pointer in a struct

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

struct Person {
        char *forename;
        char *surname;
        int age;
};

void change_struct(struct Person *person, char *forename, char *surname,
                int age);
void print_struct(struct Person *person);

int main(void)
{
        struct Person person1;
        person1.forename = malloc((strlen("Max") + 1) * sizeof(char));
        if (!person1.forename) {
                exit(EXIT_FAILURE);
        }
        strcpy(person1.forename, "Max");
        person1.surname = malloc((strlen("Mustermann") + 1) * sizeof(char));
        if (!person1.surname) {
                exit(EXIT_FAILURE);
        }
        strcpy(person1.surname, "Mustermann");
        person1.age = 35;

        print_struct(&person1);

        change_struct(&person1, "Hans", "Bauer", 45);

        print_struct(&person1);

        free(person1.forename);
        free(person1.surname);

        exit(EXIT_SUCCESS);
}

void change_struct(struct Person *person, char *forename, char *surname,
                int age)
{
        person->forename = realloc(person->forename,
                                   (strlen(forename) + 1) * sizeof(char));
        if (!person->forename) {
                exit(EXIT_FAILURE);
        }
        strcpy(person->forename, forename);
        person->surname = realloc(person->surname,
                                  (strlen(surname) + 1) * sizeof(char));
        if (!person->surname) {
                exit(EXIT_FAILURE);
        }
        strcpy(person->surname, surname);
        person->age = age;
}

void print_struct(struct Person *person)
{
        printf("%s\n", person->forename);
        printf("%s\n", person->surname);
        printf("%d\n", person->age);
}

When assigning a string to a pointer in a struct is it well-defined behavior if I would do

person1.forename = "Max";
person1.surname = "Mustermann";

in main() initially instead of using malloc() and strcpy()? (Of course in this specific case I would need to also change the realloc() calls in change_struct() since it is undefined behavior when realloc() receives a non- malloc(), calloc(), or realloc() created pointer.) If dynamic memory allocation should be required could you give an explanation why?