bool LastNameFilter(Perosn perosn) => FilterLastNameBox.Text.Equals(string.Empty) || perosn.LastName.ToLower().StartsWith(FilterLastNameBox.Text.ToLower());
bool AgeFilter(Perosn perosn) => int.TryParse(FilterAgeBox.Text, out int age) ? perosn.Age.Equals(age) : FilterAgeBox.Text.Equals(string.Empty);
