Morgan Co. Ky marriage records list license issued to George Mays and Nancy Whitt on 14 Nov 1857, no return.

1860 census of Morgan Co., Ky, district 1, enumerated 25 July, lists on p. 98 as family #608/602:
George Mays, 25, laborer; Nancy, 21; Nathan, 1; Sarrah Mays, 21. All born in Kentucky.

I do not know whether Nathan died young, or if he is the same person as their son John, listed as 10 in 1870 and 21 in 1880.

1870 census of Elliott Co., Kentucky, precinct #3, Newcombe Fork, lists as family #80:
Mays, George, 34, farmer; Nancy, 27; John, 10; Jeff D., 9; Henry W., 5; Faren (son), 2. All born in Kentucky.

Neighbors are Alex Sturgion and George W. Whitt.

1880 census of Elliott Co., Kentucky, precinct #2, Devil’s Fork, lists as family #71:
Mayes, George, 45, farmer; Nancy, 39; John, 21; Jeff D., 18; Henry W., 16; Clearsine, 10; Nancy, 9; Mourning, 4. All born in Kentucky.

Neighbors are Lindsey Mayes (age 30) and Allen Whitt.