what is the wrong with this implementation of Comparable<T>

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Hello!

I have the following simple program below.
What is the problem when I get runtime error for
"Failed to compare two elements in the array ?"

using System;
using System.Collections.Generic;
using System.Text;
using System.Collections;

namespace ConsoleApplication15
{
class Program
{
static void Main(string[] args)
{
ArrayList list = new ArrayList();
list.Add(new Person("tony", 13));
list.Add(new Person("olle", 23));
list.Add(new Person("stina", 53));
list.Add(new Person("august", 3));
list.Add(new Person("roland", 33));

foreach (Person pers in list)
Console.WriteLine(pers.Age);

list.Sort();
foreach (Person pers in list)
Console.WriteLine(pers.Age);
}
}

public class Person : IComparable<Person>
{
string name;
int age;

public Person(string lname, int lage)
{
name = lname;
age = lage;
}

public int Age
{
set {age = value;}
get {return age; }
}

public int CompareTo(Person other)
{
return this.Age - other.Age;
}
}
}


//Tony


.

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