Object oriented design for three types which two are exactly the same

I have three types of Persons:

    Class Normal
{
    string FirstName { get; set; }
    int Age { get; set; }
}

    Class Better
{
    string FirstName { get; set; }
    int Age { get; set; }
}

    Class Best
{
    string FirstName { get; set; }
    int Age { get; set; }
    string Address { get; set; }
    int Score { get; set; }
}

what is the best way to put them in one list? I myself came up with:

 public enum PersonType
{
    Normal = 0,
    Better = 1,
    Best  = 2
}

public interface IPerson
{
    PassengerType Type { get; set; }
    string FirstName { get; set; }
    int Age { get; set; }
}

And then

public class Person:IPerson
{
    public PassengerType Type { get; set; }
    public string FirstName { get; set; }
    public int Age { get; set; }
}

which I can use it for both Normal and Better and I can make distiction by type and

public class Best:IPerson
{
    public PassengerType Type { get; set; }
    public string FirstName { get; set; }
    public int Age { get; set; }
    public string Address { get; set; }
    public int Score { get; set; }
}

and eventually: List ....

Is this a good design? what if a 'best' instance is created, but type is set to Normal. would it be a bad design?