1850 Lower Okaw Twp, Coles Co, IL. By that census time, he was an orphan. John, at 9, and brother David, 11, lived with their Uncle John Whitley.
7/24/1860 Coles Co, IL. The census taker found John, 15, and brother David, 21, living with the Robert and Elizabeth Hamilton family along with aunt Minda Price and her 2 sons. Both John and David were day laborers
8/11/1870 N Okaw Twp, Coles Co, IL. At census time that he was 26, and living with David's family. He and David were farmers.
6/8/1880 Same place. John, 36, farmer, was still with David's family at census time.
6/15/1900 Same place. Was it this John, 49, living there was a boarder with William Jackson? He was born in IL but his parents were born in OH & MO respectively.
His age depends on which census you are reading. His birth date was anywhere from 1841 to 1855.