Is his birthdate December 14, 1914 or December 14, 1913 as indicated by the U S Social Security Death Index?
I think I trust the Virginia Birth Certificate most...
https://www.geni.com/documents/view?doc_id=6000000191239208821
It gives the 14 Dec 1913 date.
But - the Application for Social Security had the 14 Dec 1914 date.