Mynervie was born in 1898. She passed away in 1969.
Sources
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJ67-9V3), Nervie Griffin in household of William A Griffin, Felton, Haralson County, Georgia, United States; citing ED 121, sheet 7B, line 77, family 59, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 261; FHL microfilm 1,820,261.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:3WQV-7N2), Nervie E Griffen in household of Freddie D Griffen, Felton, Haralson County, Georgia, United States; citing enumeration district (ED) ED 11, sheet 3B, line 83, family 61, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 368; FHL microfilm 2,340,103.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K7GD-QC8), Nervie L Griffin in household of Freddie D Griffin, Felton, Militia District 1335, Haralson County, Georgia, United States; citing enumeration district (ED) 71-12, sheet 3A, line 3, family 40, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 683.