Barb, I too have been questioning the stated marriage of John W. and Mary Ann Reavis in Maury County, Tn..I believe that the John Randolph in the 1820 Maury County, Tn. is John C. Randolph who married Dicey Ragsdale in Williamson County, Tn. (where her father Benjamin Ragsdale lived, near where John's family lived)on June 8, 1819.
John C. and Dicey are found in Hickman County, Tn. in the 1830 census.I believe that may have just been a change in boundaries as I have seen this change in many residents of Maury/Hickman/Williamson Counties in Tennessee.
In 1840, John and Dicey are in the Marshall County, Ms census.Their ages and the ages of their children seem consistent throughout these moves.
I have searched pretty thoroughly for any marriage record in Early Middle Tennessee at our genealogy library.It seems there must be some basis to John W. and Mary Ann's marriage with an exact date given.I believe the county may be wrong though, or it just wasn't recorded there.
However, John W.'s age is a problem too.I agree it would be very unusual for a male to marry at 16.
Another thing that makes me think that the John in Maury County was John C., not John W., is that John C.'s sister Mary "Polly" Heron Randolph was married there in 1821, most likely at his home, as John C. was B.M. for his other sister Elizabeth Randolph. I believe that their mother was Cloey Randolph of 1820 Williamson County, Tn..She disappears from the 1830 census.I believe she died before Polly's marriage.
If you find something that refutes our findings, I would very much like to hear about it.Thanks,Janice