My first c++ program!

#include <iostream>
#include <windows.h>
using namespace std;

int main()
{
    double yearywb, month, day, year, age, tmonth, tday, num1, num2, num3, num4, num5;
    cout << "Welcome to your age calculator (YAC) \n" << "Maker : Kevin Laig \n\n";
    cout << "What year were you born? \n";
    cin >> yearywb;
    cout << "What month were you born(may = 5, okt = 10)? \n";
    cin >> month;
    cout << "What day were you born?(1-31) \n";
    cin >> day;
    cout << "What year is this? \n";
    cin >> year;
    cout << "What month is this?(1-12) \n";
    cin >> tmonth;
    cout << "What day is it? (1-31)\n";
    cin >> tday;
    num1 = year - yearywb;
    num2 = tmonth - month;
    num3 = tday - day;
    cout << "You are " << num1 << " years, " << num2 << " month(s) and " << num3 << "days old. \n\n";
    cout << "NOTE: if the answer for months is -X then calculate 12 - X";
    cout << endl;
    cout << "(X = a number you got for months) and you get the real answer but if "<<endl <<"your answer is -x for days then look from calendar how many" << endl << "days in this month are (28/30/31) and do 28/30/31 - X" << endl << "(X = the number you got for days) \n\n ";
system("pause");
    return 0;
}