public void GetOldestPersonsInCity_for_Chester_has_5_with_same_age()
{
var oldestInChester = _statistics.GetOldestPersonsInCity("Chester");
Debug.WriteLine($"{oldestInChester.Count} persons are born on {oldestInChester.FirstOrDefault()?.DateOfBirth}");
Assert.AreEqual(5, oldestInChester.Count);
}