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The John in KY looks plausible, but he and Millie still living 1880.
If the Green Co KY couple is correct, then there seems to be a discrepancy.
Green Co has transcribed and posted marriage records 1793-1839
There are several for RODGERS, but this is the one of interest
1-11-1826 John RODGERS m. Miley Day KERN/KERR
Getting a look at the original document might resolve the issue re: surname, altho only finding KEEN 1850 Green Co.