Input your birthdate. For the month, use numbers. Jan--1 Feb--2 Mar--3 Apr--4 May--5 Jun--6 Jul--7 Aug--8 Sep--9 Oct--10 Nov--11 Dec--12
If it is a year off, then just subtract one year. I am still working on fixing the problem. It will tell you how many months old, years old, and days old you are.
