Same book - Donis Marshall - Linq usage

using System;

namespace Example
    {

    class Person
        {
        public Person(string _name, int _age)
            {
            name = _name;
            age = _age;
            }
        public string name = "";
        public int age = 0;
        }
    class Startup
        {
        static void Main()
            {
            Person[] people = {new Person("John", 35),
                                new Person("Jill", 24),
                                new Person("Sarah", 29),
                                new Person("Mary", 28)};
            foreach (Person p in people)
                {
                if (p.age >= 30)
                    {
                    Console.WriteLine(p.name);
                    Console.WriteLine("Press any key to continue. . .");
                    Console.ReadKey();
                    }
                }
            }
        }
    }