C++ :: Assignment Operator But With Some Member Exceptions

The task is to use the assignment operator of a class, but change all the data except certain ones. For example, below we are to assign all Person data of 'other' except for 'name' and 'ID':

#include <iostream>
#include <string>
struct Person {
std::string name;
int ID, age, height, weight;

[Code] .....

Name = Bob
ID = 2047
Age = 38
Height = 183
Weight = 170

Name = Frank
ID = 5025
Age = 25
Height = 190
Weight = 205

Bob pretends to be Frank, but keeps his name and ID.

Name = Bob
ID = 2047
Age = 25
Height = 190
Weight = 205

But I think the way I did it is pretty lousy (note the wasted steps changing the name and ID only to revert them back? So the ideal solution should require no wasted steps, unlike the method above, and changes to what the exclusions should be should be in only one place (not two like above). Of course, we assume that Person shall have many, many data members (and constantly increasing), so that simply defining Person::operator= (const Person& other) to handle all data except for 'name' and 'ID' is out of the question.