Has additional detail been determined for Benjamin Kingman, son of Adam and Ruth?

Question

Another site has linked Adam Kingman and Ruth White as parents of a Benjamin Kingman who died 23 Dec 1863 in New York.  However, the gravestone inscription notes his death age as 75 years, 8 months, and 8 days, which would have him born around 1789, instead of what several sources indicate should be 1779 or 1780.

Answer 1

In most cases go with the gravestone, unless you have a church birth record. The family probably would of made sure (to the best of their knowledge) that his gravestone had the right dates on it.

Answer 2

Since this headstone looks like it's an original,   I'd also go with the date on the headstone.  That might change if you're certain you've located a birth record in the future.

The Tombstone Birthday calculator says his birthday would be April 15, 1788    

http://www.searchforancestors.com/utility/birthday.html

You probably already have his Find A Grave info

{{FindAGrave|101357479}}  Busti Cemetery, Busti, Chautauqua County, New York