This source is cited by some online trees for a birth date of 20 Sep 1751. This date can't be found in the Freetown, Massachusetts records (where Ezra, Abner, and Eleazor are listed). It is possible that it is a fabrication. However, the wife of Sylvanus Wilbor had to have been born well before 1769, and their marriage record says that Sylvia was the daughter of James.