Person.cs

public class Person
{
    public Guid Id { get; private set; }
    public string FullName { get; private set; }
    public DateTime BirthDate { get; private set; }
    public string Email { get; private set; }
    public string PhoneNumber { get; private set; }
    public string Tribe { get; private set; }
    public PreferredCommunication PreferredCommunication { get; private set; }

    public Person(string fullName, DateTime birthDate, string email, string phoneNumber, string tribe, PreferredCommunication communication = PreferredCommunication.Email)
    {
        Id = Guid.NewGuid();
        FullName = fullName;
        BirthDate = birthDate;
        Email = email;
        PhoneNumber = phoneNumber;
        PreferredCommunication = communication;

        if (this.BirthDate > DateTime.Now)
        {
            throw new ArgumentOutOfRangeException("BirthDate", "Future dates not allowed");
        }
    }
}