using System;

public class Program
{
    public class Meibo
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public int Age { get; set; }
    }

    static void Main(string[] args)
    {
        var meibo = new Meibo[]{
            new Meibo{Age = 10},
            new Meibo{Age = 50},
            new Meibo{Age = 30}
        };

        Array.Sort(meibo, (x, y) => y.Age - x.Age);

        // 結果表示
        foreach (var item in meibo)
        {
            Console.WriteLine(item.Age);
        }
    }
}