.Json not reading a line of the text file - c#-4.0

Question

the problem is that the DOB is not taking any values from the text file, when I print out the DOB it does not give me the date of birth of the subjects that I have in the text file.
This code is in C# with the framework “Newtonsoft.Json”. Please help
using System;
using System.IO;
using Newtonsoft.Json;
namespace Ejercicio_1
{
//MoviStar class
public class MovieStar
{
//variables to store data
public DateTime DOB { get; set; }
public string name { get; set; }
public string surname { get; set; }
public string sex { get; set; }
public string nationality { get; set; }
/// Calculate Age
public int calcAge()
{
int daynow = int.Parse(DateTime.Now.ToString("yyyyMMdd"));
int dob = int.Parse(DOB.ToString("yyyyMMdd"));
int ans= (daynow - dob) / 10000;
return ans;
}
}
}
MovieStarDriver:
using System;
using System.IO;
using System.Collections.Generic;
using Newtonsoft.Json;
namespace Ejercicio_1
{
internal class MovieStarDriver
{
static void Main(string[] args)
{
// used StreamReader to read file content
StreamReader s = new StreamReader(#"C:\Users\Mengueche\Documents\Task_1\input.txt");
string jsonString = s.ReadToEnd();
// objects list of MovieStar class
List<MovieStar> objs = JsonConvert.DeserializeObject<List<MovieStar>>(jsonString);
// iterate through the list of objects and display results
foreach (MovieStar star in objs)
{
Console.WriteLine(star.name + " " + star.surname);
Console.WriteLine(star.sex);
Console.WriteLine(star.nationality);
Console.WriteLine(star.calcAge() + " years old");
Console.WriteLine();
}
Console.ReadKey();
}
}
}