using System;

public class Program

{

    public static void Main(String[] args)

 {

   Console.WriteLine("Please enter your age");

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

   if(age <18)

   {

     Console.WriteLine("You are Child.");

   }

 else if (age >= 18 && age < 65)

    {

     Console.WriteLine("You are Adult.");

   }

 else if (age > 65)

    {

     Console.WriteLine("You are senior citizen");      

   }

   }

   }

​