CPP Age Check

#include <iostream.h>                        //For output
#include <conio.h>                        //For getch()

void main()                                //Most important part of the program!
{
  int age;                                //Need a variable...
  cout<<"Please input your age: ";        //Asks for age
  cin>>age;                                //The input is put in age
  if(age<100)                                //If the age is less than 100
  {
     cout<<"You are pretty young!";     //Just to show you the output
  }
  if(age==100)                                //Remember, if the age equals 100 needs two =
  {
     cout<<"You are old";                //Just to show you it works...
  }
  if(age>100)
  {
    cout<<"You are really old";                //Proof that it works for all conditions
  }
}