Here is a letter from another list --- just thought all of you may be interested. It works for me, enjoy, Bill ------------------------- DETERMINING DATE OF BIRTH Bette Butcher Topp provided the following simple formula for determining a birthdate when you know the date of death and age. It's called "Formula 8870." Example: Died 6 May 1889 18890506 Age 71 years 7 mos. 9 days 710709 _________ 18179797 -8870 ________ 18170927 and I am informed that there is also a website that will do the calculation: http://enws347.eas.asu.edu:8000/~buckner/bdform.html