Part 2: Test 1: How old are you?

#include <iostream>
#include <ctime>
#include <string>

int main()
{
int birthYear;
int age;
time_t seconds;
double numYears;
int currentYear;
std::string message;


// seconds since January 1, 1970
seconds = time(NULL);

//ok the following does not account for leap years...
//works right now, but would probably break over time.
numYears = seconds/(3600*24*365);
currentYear = 1970 + (int) floor(numYears);
std::cout << "Please enter your birth year(YYYY): ";
while(true)
{
    if(std::cin >> birthYear)
    {
        if(birthYear < 0)
        {
            std::cin.clear();
            std::cin.ignore();
            std::cout << "Please enter a real year: ";
        }
        else
        {
            break;
        }
    }
    else
    {
        std::cin.clear();
        std::cin.ignore();
        std::cout << "Sorry I didn't get that, please enter your birth year: ";
    }

}

age = currentYear - birthYear;

if ( age >= 21)
{
    message = "Here is a Beer";
}
else if ( 18 <= age && age < 21)
{
    message = "You can vote or join the military";
}
else if ( 16 <= age && age < 18)
{
    message = " You can drive now";
}
else if ( age < 16)
{
    message = "Sorry no perks besides being a kid";
}
std::cout << "Your Approximate age is: " << age << "\n" << message << "\n";

system("PAUSE");

}