Adolphus D Fann was born 21 Nov 1850
Samuel Alpheus Fann was born 12 Feb 1850
Therefore, they both were presumptively about 9 or 10 at the 1860 census that showed them as:
Olphas, 5 (Alpheus)
Adolphus, 7
I am inclined, as I indicated elsewhere, to go with the birth date on the medical examiner's certificate, as he was probably the most literate person to do any reporting.
Thanks for the note about looking at his brothers data. By some reports, they were by different fathers, and their mother clearly never married.
I wrote the brother's profile much earlier in my work on WikiTree, so I might need to take another pass at it since it was last edited 7 Sep 2019, and by re-examining these age questions, I might come up with more direction.