UPDATE for others researching this line: Info from Linda & Ray Muerer via private e-Mail: The David I found in 1870 TX Census Trinity Co. pg.337 - 32years old farmer from Miss. Wife Mrs. Nancie [age] 30 b. Miss. ch - Samuel 14, William 13, Marie 8, Marthie 4, Columbus 1, all born in Texas. Marie Ainsworth age 71 born 1799 SC is another HH. There is also a Marie b. 1826 Ala,Alfred b. 1843 Miss, James b. 1847 Miss, Levin b. 1833 Miss, and Garrot [Garrett? CLA} b. 1837 Miss. all in the Trinity census 1870.
End of Ray's info.
For others who encountered discrepancies in dates concerning Samuel A. Ainsworth, this information, when verified by actual census records, seems to be very enlightening.
Tombstone reads b. 1845 Death certificate reads b. 1851 Marriage License indicates b. 1856 [Marriage License reads age 23 in 1879) when he married Martha Jane Archer.
Using the census 1870 census, age 14, he would be 23 when he married in 1879.
The death certificate has demonstrable errors. It lists his MOTHER'S full maiden name as Martha Jane Archer. Actually, she was his WIFE, not his mother. Death certificate information was supplied by Samuel's oldest child, Cora Nancy Jane (Ainsworth) Martin. It is easy to see how she may have made this mistake under the stress of supplying information at her father's death.
Also, the marriage license is a DIRECT link to the mind of Samuel, and is undoubtedly correct.Thus, I conclude that he was born in 1856, and his tombstone and death certificate are in error.
An interesting note on the death certificate under undertaker: "home made casket." (not unusual in those days - CLA).