Montgomery County OH@ Trails to the Past
How to calculate the date of birth
From Platte Co, MO Historical/Genealogical Society
 
 
 
 In the event you don't have a computer close at hand to do the calculating:
 
 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.
 
  1.  Write the year, month, day as:->18890506
  2. Subtract the age at death:------->710709
  3. This gives the figure:--------->18179797
  4.  Now subtract 8870:----------------->8870
  5.  The result is:----------------->18170927

 Year 1817, 9th month (Sept), 27th day or 27 Sept, 1817
 
 
 

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