using System;

​

Console.WriteLine("No static void main");

​

var p = new Person(Guid.NewGuid(), "John", new DateOnly(1975, 1, 1));

Console.WriteLine(p.ToString());

​

public record Person(Guid Id, string Name, DateOnly DateOfBirth)

{

    public override string ToString()

    {

        var currentDate = DateOnly.FromDateTime(DateTime.Today);

        var age = currentDate.Year - DateOfBirth.Year;

        var months = currentDate.Month - DateOfBirth.Month;

        if (currentDate.Day < DateOfBirth.Day)

            months--;

​

        if (months < 0)

        {

            age--;

            months += 12;

        }

​

        return $"{Name} is {age} years and {months} months old";

    }

}