C# help says namespace error

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C#

It's saying that the namespace for, "visitor" and "person" is not found. I'm stuck. Do I have to declare both as strings? My Assignment was to

Create a class called “Person” that has the following public member variables:
 Age (int)
 FirstName (string)
 LastName (string)
 Spouse (Person)
The Person class should also have the following public static variable:
 SumOfAllAges (double)
The Person class should also have the following public methods:
 GetFullName (string)
 PrintNameAndAge (void)
In your main program, you will declare two variables of type Person named “p1” and “p2”.
Ask the user to provide you with the name, age, and marital status of both individuals.
Also, ask for the first name and age of their spouses.
While you are doing this, keep track of the sum of all ages in the static variable you made.
You can assume the spouse automatically gets the same last name as the individual.
Don’t forget to set the “Spouse” variable to the appropriate value for all four people.
After you have collected this information:
 Invoke “PrintNameAndAge()” on each of the four people.
 Print out the single average age of the people. (SumOfAllAges / 4)
You may only have 2 “Person” type variables local to the Main Program. (p1 and p2)
The spouses must be referenced through the “p1.Spouse” and “p2.Spouse” variables.

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What I have tried:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
namespace Rextester
{
public class Program
{
public static void Main(string[] args)
{
Person p1 = new vistor();
System.Console.WriteLine("What's your first name?");
p1.fName = System.Console.ReadLine();
System.Console.WriteLine("Now tell me your last name.");
p1.lName = System.Console.ReadLine();
System.Console.WriteLine("Please tell me your age now.");
p1.Age = int.Parse(System.Console.ReadLine());
p1.Lover = new vistor();
Person.TotalofAllAges + Person.TotalofAllAges + p1.Age;
p1.PrintNameAndAge();
System.Console.WriteLine("What's your lover's name?");
p1.Lover.fName = System.Console.ReadLine();
p1.Lover.lName = p1.lName;
System.Console.WriteLine("What's their age?");
p1.Lover.age = int.Parse(System.Console.Readline());
p1.Lover.Lover = p1;
Person.TotalofAllAges = Person.TotalofAllAges + p1.Lover.Age;
p1.Lover.PrintNameAndAge;
Console.WriteLine("Press P to go on");
Console.ReadLine();
}
}
}