My 3rd great grandfather, Joseph Clark (Wife, Abigail Booth) b.1773 MA- d. 1861 NY- is buried at Mallory Corners Cemetery- the record states he died Sept.18, 1861 at age 88y 2m 17d. I calculated his birthdate by Age at Death Calculation and it came as Thurs July 1,1773. 'Landmarks of Steuben County" gives his birthdate as June 10, 1772. Didn't help me in a search- but just thought i'd put it out there for others.