01. Ages

using System;

namespace Ages
{
    class Program
    {
        static void Main(string[] args)
        {
            int age = int.Parse(Console.ReadLine());
            string personStatus = "";

            if (age >= 0 && age <= 2)
            {
                personStatus = "baby";
            }
            else if (age >= 3 && age <= 13)
            {
                personStatus = "child";
            }
            else if (age >= 14 && age <= 19)
            {
                personStatus = "teenager";
            }
            else if (age >= 20 && age <= 65)
            {
                personStatus = "adult";
            }
            else if (age > 65)
            {
                personStatus = "elder";
            }

            Console.WriteLine(personStatus);
        }
    }
}


Рещение с тернатен оператор:

using System;

namespace Ages
{
    class Program
    {
        static void Main(string[] args)
        {
            int age = int.Parse(Console.ReadLine());

            string personStatus =
                age >= 0 && age <= 2 ? "baby" :
                age >= 3 && age <= 13 ? "child" :
                age >= 14 && age <= 19 ? "teenager" :
                age >= 20 && age <= 65 ? "adult" :
                age > 65 ? "elder" : "";

            Console.WriteLine(personStatus);
        }
    }
}