ok I got this far in the code but I can't seem to get a person to enter an age and the program to return the info of those with the same age.

I think this is what I need to use...or at least something like this on my code.

/////                                                                                  
int search(student[], int size, int anAge);
{
  for (int i=0; (i<size); i++)
    if (Slist[i].Age == anAge)
      {
        return i;
      }
}
////   


#include <iostream>
#include <string>
#include <fstream>

using namespace std;

struct student
{
  string Name;
  char   Gender;
  string Major;
  int    Age;
};

void GatherData(student[], int);                                                                                 
void DisplayStudent(student[], int);
void BubbleSort(student[], int);                                                                                

int main()
{
  student MyClass[10];
  GatherData(MyClass, 10);                                                                   
  BubbleSort(MyClass, 10);
  for (int s=0; s < 10; s++)
    DisplayStudent(MyClass, s);

  return 0;
}

void GatherData(student Slist[], int size)
{
  student Default = {"lastname, firstname", 'gender', "major", age};
  int i = 0;
  ifstream inFile("hw1.txt", ios::in);
  string last, first;
  while (inFile >> first)
    {
      inFile >> last;
      Slist[i].Name  = last + ", " + first;
      inFile >> Slist[i].Gender;
      inFile >> Slist[i].Major;
      inFile  >> Slist[i].Age;
      i++;
    }
  for (int j = i; j < size; j++)
    {
      Slist[j] = Default;
    }
}


void DisplayStudent(student Slist[], int slot)
{
  cout << "Name: " << Slist[slot].Name << endl;
  cout << "Gender: " << Slist[slot].Gender << endl;
  cout << "Major: " << Slist[slot].Major << endl;
  cout << "Age: " << Slist[slot].Age << endl;
}

void BubbleSort(student Slist[], int N)
{                                                           
  student temp;
  for (int pass = 1; pass <= N-1; pass++)                             
  {
    bool didIf= false;
    for (int item= 0; item <  N-pass; item++)
    {
        if (Slist[item].Name > Slist[item+1].Name)
          {
            didIf = true;
            temp= Slist[item];
            Slist[item] = Slist[item+1];
            Slist[item+1] = temp;
          }
    }                                          
    if (didIf == false) return;
  }
}

When you read the Rules as requested upon signing up, what part of using CODE tags was unclear? Or even the post titled "Read this before posting"?