I misread your question here is my updated solution.
when you create an instance of the class with
keyword it creates a new instance and new memory block for that instance hence it can have different values for the same member of the class.
public string StudentName = string.Empty;
public int Age = 0;
public void ManageStudents()
Student student1 = new Student();
student1.Name = "Student 1";
Student student2 = new Student();
student2 .Name = "Student 2";
int age = 10;
private ChangeStudentAge(Student student,int newAge)
newAge = 100;