From the Grayson Co, KY 1810 census, Nimrod had at least 8 children: 2 males b 1784-94, John b 1795; male & female b 1794-1800, male and female b 1800-10; and probably Gambrel b c1806. He also had son Elijah b 1775-84 m 1805 Winnefred JETT.He may have had other, earlier children, but I haven't found other records to indicate this. Nimrod himself was born before 1765.From this info, it looks like Nimrod married (in SC) c1782; and was probably born c1762. This would make him a contemporary of John CRADDOCK and brother of Sarah.
Do you have any record that indicates BARTLETT as Sarah's maiden name?
I'm trying to find as many "puzzle pieces" (however remote) as I can for the BARTLETTs and CRADDOCK, COX, CLARK, RICHEY and any other neighbors who may have gone to SC and/or from SC to KY as a group.
Nimrod's son John BARTLETT b 1795 KY married 1818 Barren Co, KY Elizabeth "Betsy" RICHEY who was the dau of John RICHEY & Tabitha SPENCER who also came to KY from SC.John RICHEY died and Tabitha 2m George W WOODS.In Hot Springs, AR 1850 census are John BARTLETT 55, Betsy 50... [some of their ch]; Geroge W WOODS 70 VA; Tabith 69 SC) which ties the RICHEY & SPENCER families back to SC, too. [NB: Nimrod and several of his children moved to AR in 1820-40 time frame.