Can I do an ID foreach instance of class?

I’m a newbie in c#. I am just trying to do an ID for each instance in class Person.

class Person
    {
        public Person(string name, int age)
        {
            countPersons++;
            this.name = name;
            this.age = age;
        }

        public string name { private get; set; }
        public int age { private get; set;}
        private static int countPersons { get; set; }
        
        public void GetNameAndAge()
        {
            Console.WriteLine($"Player name: {name ?? "unknown"} | Player age: {age}");
        }
        public void GetInfo()
        {
            Console.WriteLine($"Player name: {name ?? "unknown"} | Player age: {age}\nId: {countPersons}");
        }

    }

I want every class instance to have an id that starts from one (one, two, three, etc.)

class Program
    {
        public static void Main(string[] args)
        {
            var player1 = new Person("David", 31);
            var player2 = new Person("Brad", 23);
            var player3 = new Person("Michael", 26);

            player1.GetNameAndAge();
            player1.GetInfo();
            player2.GetInfo();
            player3.GetInfo();
        }
    }

But at the end of the program, the ID for everyone is 3…
(The variable countPersons is my ID)

>Solution :

You have to hold that in variable or property.

class Person
    {
        public Person(string name, int age)
        {
            id = countPersons++;
            this.name = name;
            this.age = age;
        }
        int id;
        public string name { private get; set; }
        public int age { private get; set;}
        private static int countPersons { get; set; }
        
        public void GetNameAndAge()
        {
            Console.WriteLine($"Player name: {name ?? "unknown"} | Player age: {age}");
        }
        public void GetInfo()
        {
            Console.WriteLine($"Player name: {name ?? "unknown"} | Player age: {age}\nId: {id}");
        }

    }

Note:

• Static will increase with each instance creation.
• id will hold that vlaue.