问使用foreach循环的操作和LINQ之间的区别是什么？

EN

public Person GetOldestMember()
{
    Person oldestPerson = people.OrderByDescending(x => x.Age).FirstOrDefault();

    return oldestPerson;
}

public Person GetOldestMember()
{
    Person oldestPerson = new Person(-1); //this is a constructor with parameter age

    foreach (Person person in people)
    {
        if (person.Age > oldestPerson.Age)
        {
            oldestPerson = person;
        }
    }

    return oldestPerson;
}