How old are you?

/*
    How old are you? Are you an anchent or green? :D
*/
#include <iostream>

using namespace std;

int main() {
    int age;

    cout << "Please enter you're age: ";

    cin >> age;

    while(age < 0) {
        cout << "Invalid age, your age has to be greater than 0" << endl;
        cin >> age;
    }

    if(age >= 21) {
        cout << "Well at least you old enough to dring so here's a beer!!!" << endl;
    } else if(age < 21 && age >= 18) {
        cout << "Congrats, you can smoke ciggaretts or cigars, join the military, get married, and vote." << endl;
    } else if(age < 18 && age >= 16) {
        cout << "Well, you can finally drive a car and get a part time job. So its time for you to pay rent." << endl;
    } else {
        cout << "A youngen eh, well at least you can get away with pretty much anything." << endl;
    }

    return 0;
}