Tombstone Birthday Calculator
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Use the free online Tombstone Birthday Calculator at http://www.searchforancestors.com/utility/birthday.htmlhttp://www.searchforancestors.com/utility/birthday.html
to calculate a birthdate from the death date and age of death located on a tombstone or death certificate.
The page also explains how to do the calculation by hand.
Although a tombstone or death certificate is not considered a primary source for a birthday,it can give you an approximate date of birth to help in further research.