Here's how to use the "magic" 8870 formula.
Here's an example: Ancestor died May 6, 1889 at the age of 71 years, 7 months and 9 days, convert those to numbers
18890506 (year 1889, month 05, day 06) subtract the age
-710709 (71 years, 7 months, 9 days)
equals= 18179797 then subtract the magic number
-8870
giving 18170927 or year 1817, month 09, day 27 or 27 September 1817
Note that when you have more than 30 days in the "days" column, subtract 30 from the days and add 1 to months.
Likewise when you have more than 12 in the "months" column, subtract 12 and add one to the "years" column
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