Found this interesting calculator for genealogy purposes: <A HREF="http://www.longislandgenealogy.com/birth.html">Birth Date Calculator </A> http://www.longislandgenealogy.com/birth.html ========== Birth Date Calculator This calculator is a useful tool for genealogists. It is designed to calculate the birth date when the age at death and the date of death are the only facts known. As we all know this is often the only information recorded on older headstones. Sometimes all that is listed on tombstone is, ie: John Jones, died 1903 age 73 years, 10 months and 20 days