It’s a funny thing about searching for ancestors, there are errors everywhere. Birth years in particular are very unpredictable. The census records are not always accurate. Death certificates are only as good as the person reporting the information. Marriage records often have fabricated ages. Emerson Corville not only created an alias for himself, he fibbed about his age so often that none of the descendants really knew how old he was. Recently I found his baptism record from Wells-Next-the-Sea, Norfolk, England. Despite the tombstone indicating his birth year as 1833, we now know he was actually born in 1835.