main.cpp

using namespace std;
#include <iostream>

class Person{
    public:
        int age;
        Person(int initialAge);
        void amIOld();
        void yearPasses();
    };

    Person::Person(int initialAge){
        this->age = initialAge;
        if(initialAge<0)
          cout << "Age is not valid, setting age to 0."<<endl;
    }

    void Person::amIOld(){
        if(age<13)
          cout << "You are young."<<endl;
          else if(age>=13 && age <18)
            cout << "You are a teenager."<<endl;
            else
            cout<<"You are old."<<endl;
    }

    void Person::yearPasses(){
        
        age=age+1;

    }

int main(){
    int t;
	int age;
    cin >> t;
    for(int i=0; i < t; i++) {
    	cin >> age;
        Person p(age);
        p.amIOld();
        for(int j=0; j < 3; j++) {
        	p.yearPasses(); 
        }
        p.amIOld();
      
		cout << '\n';
    }

    return 0;
}