there is such a big age difference between the husband and wife, I suspect she may be the second wife.
The 1900 census reflects the information in the genealogy.
But there is an 1880 census for the same town for a man named Obe Duvall
"United States Census, 1880," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:M6F8-8QC : accessed 30 April 2016), Obe Duvall, Beauvais, Ste Genevieve, Missouri, United States; citing enumeration district ED 134, sheet 596D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0715; FHL microfilm 1,254,715.
In this case, the wife's name was Josette and they had a 25 year old daughter named Emily.