public static void Main()
Console.WriteLine("Type you age: ");
age = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("The age {0} is invalid!", age);
Console.WriteLine("The age {0} is greater than {1}!", age, max);
Console.WriteLine("The age {0} is valid!", age);
Console.WriteLine("Gender (select M for Male or F for female): ");
string gender = Console.ReadLine();
switch (gender.ToUpper()){