In reply to my own posting : ) In analyzing this formula, I believe it will only be accurate to within a few days of the birthdate. Looks like it assumes an average of 30 days per month (which we know is not wholly accurate). But it can be a start anyway. - Jill > I got this quite a while back from one of the other lists: > > REMEMBER 8870 > That's not an error: It's the number to remember > when you want to find the birthdate of someone > when you only have the date of death and age. > > How do you figure the birthdate? Suppose the > person died May 6, 1889, at the age of 71 years, 7 months, 9 days. > > ****Write the year, month, day as:->18890506 > ****Subtract the age at death:------->710709 > ****This gives the figure:--------->18179797 > ****Now subtract 8870:----------------->8870 > ****The result is:----------------->18170927 > > Year 1817, 9th month (Sept), 27th day or 27 Sept, > 1817 > > > (and obviously, if the answer comes up with, for instance, the 13th month, > you would assume the 1st month of the next year, etc.) > > > Jill Arthur Barry > <.><.><.><.><.><.><.><.><.><.><.><.><.><.><.> > Researching surnames in: > INDIANA - Arthur, Murnan, McGahey > MICHIGAN - Boboltz, Mitchell, Doezema, > WISCONSIN - Barry, Oravez, Hadrian > and tons more. . .