using System;

public class Program

{

    public static void Main()

    {

        DateTime MemberDoB = new DateTime(1989,1,5);

        DateTime ClaimDate = DateTime.Today;

        Console.WriteLine("Using " + ClaimDate.ToShortDateString() + " as Claim Date, " + MemberDoB.ToShortDateString() + " as Member's birth date");

        Console.WriteLine("MemberAgeMonths: " + EvaluateMemberAgeMonths(ClaimDate,MemberDoB).ToString());

        Console.WriteLine("MonthDifference: " + MonthDifference(ClaimDate,MemberDoB).ToString());

        ClaimDate = ClaimDate.AddMonths(-20);

        Console.WriteLine("Using " + ClaimDate.ToShortDateString() + " as Claim Date, " + MemberDoB.ToShortDateString() + " as Member's birth date");

        Console.WriteLine("MemberAgeMonths: " + EvaluateMemberAgeMonths(ClaimDate,MemberDoB).ToString());

        Console.WriteLine("MonthDifference: " + MonthDifference(ClaimDate,MemberDoB).ToString());

        MemberDoB = new DateTime(2018,5,5);

        ClaimDate = DateTime.Today;

        Console.WriteLine("Using " + ClaimDate.ToShortDateString() + " as Claim Date, " + MemberDoB.ToShortDateString() + " as Member's birth date");

        Console.WriteLine("MemberAgeMonths: " + EvaluateMemberAgeMonths(DateTime.Today,MemberDoB).ToString());

        Console.WriteLine("MonthDifference: " + MonthDifference(DateTime.Today,MemberDoB).ToString());

        MemberDoB = new DateTime(2018,5,15);

        Console.WriteLine("Using " + ClaimDate.ToShortDateString() + " as Claim Date, " + MemberDoB.ToShortDateString() + " as Member's birth date");

        Console.WriteLine("MemberAgeMonths: " + EvaluateMemberAgeMonths(DateTime.Today,MemberDoB).ToString());

        Console.WriteLine("MonthDifference: " + MonthDifference(DateTime.Today,MemberDoB).ToString());

​

        MemberDoB = new DateTime(2016,12,5);

        Console.WriteLine("Using " + ClaimDate.ToShortDateString() + " as Claim Date, " + MemberDoB.ToShortDateString() + " as Member's birth date");

        Console.WriteLine("MemberAgeMonths: " + EvaluateMemberAgeMonths(DateTime.Today,MemberDoB).ToString());

        Console.WriteLine("MonthDifference: " + MonthDifference(DateTime.Today,MemberDoB).ToString());

        MemberDoB = new DateTime(2016,11,5);

        Console.WriteLine("Using " + ClaimDate.ToShortDateString() + " as Claim Date, " + MemberDoB.ToShortDateString() + " as Member's birth date");

        Console.WriteLine("MemberAgeMonths: " + EvaluateMemberAgeMonths(DateTime.Today,MemberDoB).ToString());

        Console.WriteLine("MonthDifference: " + MonthDifference(DateTime.Today,MemberDoB).ToString());

        MemberDoB = new DateTime(2016,10,5);

        Console.WriteLine("Using " + ClaimDate.ToShortDateString() + " as Claim Date, " + MemberDoB.ToShortDateString() + " as Member's birth date");

        Console.WriteLine("MemberAgeMonths: " + EvaluateMemberAgeMonths(DateTime.Today,MemberDoB).ToString());

        Console.WriteLine("MonthDifference: " + MonthDifference(DateTime.Today,MemberDoB).ToString());

        MemberDoB = new DateTime(2016,11,6);

        Console.WriteLine("Using " + ClaimDate.ToShortDateString() + " as Claim Date, " + MemberDoB.ToShortDateString() + " as Member's birth date");

        Console.WriteLine("MemberAgeMonths: " + EvaluateMemberAgeMonths(DateTime.Today,MemberDoB).ToString());

        Console.WriteLine("MonthDifference: " + MonthDifference(DateTime.Today,MemberDoB).ToString());

        MemberDoB = new DateTime(2016,10,6);

        Console.WriteLine("Using " + ClaimDate.ToShortDateString() + " as Claim Date, " + MemberDoB.ToShortDateString() + " as Member's birth date");

        Console.WriteLine("MemberAgeMonths: " + EvaluateMemberAgeMonths(DateTime.Today,MemberDoB).ToString());

        Console.WriteLine("MonthDifference: " + MonthDifference(DateTime.Today,MemberDoB).ToString());

    }

    public static int EvaluateMemberAgeMonths(DateTime now, DateTime memberDateOfBirth)

    {

        DateTime birthday = Convert.ToDateTime(memberDateOfBirth);

        int currentYear, currentMonth, birthMonth, birthYear, years, months;

        currentYear = Convert.ToInt32(DateTime.Now.Year);

        currentMonth = Convert.ToInt32(DateTime.Now.Month);

        birthYear = Convert.ToInt32(birthday.Year);

        birthMonth = Convert.ToInt32(birthday.Month);

        years = currentYear - birthYear;

        if (currentMonth - birthMonth > 0)

        {

            months = Convert.ToInt32(currentMonth - birthMonth);

        }

        else

        {

            years = years - 1;

            months = Convert.ToInt32((12 - birthMonth) + currentMonth);

        }

        if ((currentMonth - birthMonth == 0 || currentMonth - birthMonth == 1) && birthday.Day - now.Day > 0)

        {

            months--;

        }

        months += years * 12;

        if (months < 0)

        {

            months = 0;

        }

        return months;

    }

    public static int MonthDifference(DateTime now, DateTime memberDateOfBirth)

    {

        int months = Math.Abs((now.Month - memberDateOfBirth.Month) + 12 * (now.Year - memberDateOfBirth.Year));

        if ((now.Month - memberDateOfBirth.Month == 0 || now.Month - memberDateOfBirth.Month == 1) && memberDateOfBirth.Day - now.Day > 0)

        {

            months--;

        }

        return months;

    }

}