未正确读取 XML 文件

需要对当前 xml 文档中的数据进行反序列化。我拿了完成的 xml 文件：

<?xml version="1.0" encoding="UTF-8"?>
<root>
 <address>24</address>
 <city>New-York</city>
 <state>Alabama</state>
<firstPerson>
 <age>19</age>
 <name>Jey</name>
 <department>none</department>
</firstPerson>
 <secondPerson>
 <age>22</age>
 <name>Abraham</name>
 <department>none</department>
 </secondPerson>
</root>

并基于它生成模型

[XmlRoot(ElementName="firstPerson")]
public class FirstPerson {
    [XmlElement(ElementName="age")]
    public string Age { get; set; }
    [XmlElement(ElementName="name")]
    public string Name { get; set; }
    [XmlElement(ElementName="department")]
    public string Department { get; set; }
}

[XmlRoot(ElementName="secondPerson")]
public class SecondPerson {
    [XmlElement(ElementName="age")]
    public string Age { get; set; }
    [XmlElement(ElementName="name")]
    public string Name { get; set; }
    [XmlElement(ElementName="department")]
    public string Department { get; set; }
}

[XmlRoot(ElementName="root")]
public class Root {
    [XmlElement(ElementName="address")]
    public string Address { get; set; }
    [XmlElement(ElementName="city")]
    public string City { get; set; }
    [XmlElement(ElementName="state")]
    public string State { get; set; }
    [XmlElement(ElementName="firstPerson")]
    public FirstPerson FirstPerson { get; set; }
    [XmlElement(ElementName="secondPerson")]
    public SecondPerson SecondPerson { get; set; }
}

由于参数（年龄等）相同，所以我重新做了数据模型

 [Serializable]
[XmlRoot(ElementName="root")]
public class People
{
    public byte Address { get; set; }

    public string City { get; set; }

    public string State { get; set; }

    [XmlElement(ElementName = "firstPerson")]
    public Person FirstPerson { get; set; }

    [XmlElement(ElementName = "secondPerson")]
    public Person SecondPerson { get; set; }
}

[Serializable]
[XmlRoot(ElementName = "root")]
public class Person
{
    public byte Age { get; set; }

    public string Name { get; set; }

    public string Department { get; set; }
}

然后我读了xml：

internal class Program
{
    private const string xmlPath = "test.xml";

    private static void Main(string[] args)
    {
        var value = DeserializeSettings();

        Console.WriteLine(value.Address);
        Console.WriteLine(value.City);
        Console.WriteLine(value.State);
        Console.WriteLine(value.FirstPerson.Age);
        Console.WriteLine(value.FirstPerson.Name);
        Console.WriteLine(value.FirstPerson.Department);

        Console.ReadKey();
    }

    private static People DeserializeSettings()
    {
        try
        {
            var serializer = new XmlSerializer(typeof(People));
            var path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, xmlPath);
            var reader = new StreamReader(path);
            var people = (People) serializer.Deserialize(reader);
            reader.Close();

            return people;
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
            return new People();
        }
    }
}

结果，我得到 0 或空虚（取决于数据类型）， 我哪里出错了？