One year, ten months, nineteen days
Barnes family Bible record, Indiana (Indiana State Library)
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Mary Barnes died on
the 26th June 1842, aged
one year, ten months, and
nineteen days.
Suppose you had no birth entry for little Mary. Using her age at death, when was she born?
Correct
Not quite
Subtract in order from June 26, 1842: one year gives June 26, 1841; ten months gives August 26, 1840; nineteen days gives August 7, 1840. Check it forward: Aug. 7, 1840 plus 1 year, 10 months and 19 days lands on June 26, 1842. Family Bibles often record a child's death even when the birth was never written in.
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