{

    class Program

    {

        static void Main(string[] args)

        {

            int age;

            String age_string = "";

            Console.WriteLine("Введите возраст");

            age = Convert.ToInt32(Console.ReadLine());

            if (age < 20 || age > 69);

            Console.WriteLine("Возраст должен быть от 20 до 69..") ;

            else

            {

                if (age < 30)

                    age_string += "двадцать";

                else if (age < 40)

                    age_string += "традцать";

                else if (age < 50)

                    age_string += "сорок";

                else if (age < 60)

                    age_string += "пятьдесят";

                else

                    age_string += "шестьдесят";

                switch (age % 10)

                {

                    case 1: age_string += "один"; break;

                    case 2: age_string += "два"; break;

                    case 3: age_string += "три"; break;

                    case 4: age_string += "четыре"; break;

                    case 5: age_string += "пять"; break;

                    case 6: age_string += "шесть"; break;

                    case 7: age_string += "семь"; break;

                    case 8: age_string += "восемь"; break;

                    case 9: age_string += "девять"; break;

​

                }

​

​

                age_string += age % == 0 || age % 10 > 4 ? "лет" : (age % 10 == 1 ? "год" : "года");

                Console.WriteLine(age_string);

            }

            Console.ReadKey();

​

​

​

            }

    }

}

​