Using random variable in other class gives always 0 c#

I haven't any errors, but the program always generates 0 for AnimalAge. It should generate numbers from 1-20. This is a simple game where a player should find Age of Animal.

public class losowaniez
{
    public int AnimalAge;
    public int Age2;      
    public void losowanie()
    {
        int AnimalAge;

        Random RandomObj = new Random();
        AnimalAge = RandomObj.Next(20);
        Age2 = AnimalAge;
    }     
}        
    public class Animal:losowaniez
    {            
        public void Fish()
        {
            Console.WriteLine("Zwierze moze miec maksymalnie 10 lat, zgadnij ile ma lat");
            int x = Convert.ToInt32(Console.ReadLine());
        }
        public void zwierze()
        {
            losowaniez MyAnimal = new losowaniez();
            int AnimalAge = MyAnimal.Age2;
            Console.WriteLine("Zwierze moze miec maksymalnie 20 lat zgadnij ile ma lat");
            int x = Convert.ToInt32(Console.ReadLine());
            if (x == AnimalAge)
            {
                Console.WriteLine("Wygrales gre");
                Console.ReadKey();
            }
            else if (x > AnimalAge)
            {
                Console.WriteLine("Celuj nizej!");
                zwierze();
            }
            else
            {
                Console.WriteLine("Celuj wyzej!");
                zwierze();
            }
        }
    }