Hi Lynne - I can't tell if I am responding in the right place or not. I did just submit another reply re Josiah Charles Birthdate - yes 12 Feb 1831.
Also he is on the same census page in Caroll, Tennessee, married and with two young children, as John Wortham White and family. Here's the note I put on my ancestry.com tree for Josiah Charles White:
1860 Age: 29 Residence
District 3, Carroll, Tennessee, United States 1860 census: Josiah C. 30 farmer (real estate 350, pers prop 400); Mary P. 25, Joseph 2, Susan 10/12. On same census page as John W. White age 50 and wife Louisa age 48 and their other children.