DateTame_training

using System;

class AgeAfterTenYears
{
    static void Main()
    {
        Console.WriteLine("Enter 'Year' of birthday, use format yyyy: ");
        string checkAge = Console.ReadLine();
        int age;
        bool parseAge = Int32.TryParse(checkAge, out age);

        Console.WriteLine("Enter 'Month' of birthday, use format MM: ");
        string checkMonth = Console.ReadLine();
        int month;
        bool parseMonth = Int32.TryParse(checkMonth, out month);

        Console.WriteLine("Enter 'Day' of birthday, use format dd: ");
        string checkDate = Console.ReadLine();
        int day;
        bool parseDate = Int32.TryParse(checkDate, out day);

        if (parseAge && parseDate && parseMonth == false)
        {
            Console.WriteLine("             Enter Integer Value! \n");
        }
        else if (month > 12 || month <= 0)
        {
            Console.WriteLine("             Enter a valid number for month --> from 1 to 12   \n");
        }

        else if (day > 31 || day <= 0)
        {
            Console.WriteLine("             Enter a valid number for day --> from 1 to 31   \n");
        }

        else
        {
            DateTime birth = new DateTime(age, month, day);
            Console.WriteLine("             Birthdate:        {0:d}     \n", birth);

            DateTime today = DateTime.Now;
            TimeSpan span = today - birth;
            DateTime ageNow = DateTime.MinValue + span;

            int years = ageNow.Year - 1;
            int months = ageNow.Month - 1;
            int days = ageNow.Day - 1;

            if (years >= 70)
            {
                Console.WriteLine("         You are too Old, Go take a Break!   \n");
            }
            else if (years <= 10)
            {
                Console.WriteLine("         You are too young to play with computer!    \n");
            }
            else
            {
                Console.Write("Now you are:                     {0} years, {1} months, {2} days old. \n\n", years, months, days);

                int yearsAfter = years + 10;
                Console.Write("After 10 years you will be:      {0} years, {1} months, {2} days old. \n\n", yearsAfter, months, days);
            }
        }
    }
}