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var personCount = personList.Count();
Console.WriteLine(personCount);

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var personMin = personList.Min(p => p.Age);
Console.WriteLine(personMin);

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var personMax = personList.Max(p => p.Age);
Console.WriteLine(personMax);

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var personTake = personList.Take(3);
foreach (Person p in personTake)
{
    Console.WriteLine(p.Name + " : " + p.Age);
}

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var personOrderByDesc = personList.OrderByDescending(p => p.Age);
foreach (Person p in personOrderByDesc)
{
    Console.WriteLine(p.Name + " : " + p.Age);
}

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var personOrderBy = personList.OrderBy(p => p.Age);
foreach (Person p in personOrderBy)
{
    Console.WriteLine(p.Name + " : " + p.Age);
}

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var person2b = personList.Where(p => p.Name == "とぅーびー").ToList();
foreach (Person p in person2b)
{
    Console.WriteLine(p.Name + " : " + p.Age);
}

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var personName = personList.Select(p => p.Name);
Console.WriteLine(string.Join(", ",personName));

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static void Main(string[] args)
{
    List<Person> personList = new List<Person>();

    personList.Add(new Person() { Name = "ほげほげ太郎", Age = 20 });
    personList.Add(new Person() { Name = "ほげほげ太郎", Age = 21 });
    personList.Add(new Person() { Name = "はげはげ太郎", Age = 45 });
    personList.Add(new Person() { Name = "しーしゃーぷ", Age = 32 });
    personList.Add(new Person() { Name = "しーしぇぱーど", Age = 26 });
    personList.Add(new Person() { Name = "とぅーびー", Age = 15 });

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public class Person
{
    public string Name { get;set; }
    public int Age { get;set; }
}