Find a Grave Website lists Fanny Alger's birthdate as September 30, 1816.
"Frances Ward 'Fanny' Alger Custer," Find a Grave, accessed January 15, 2022
Frances Ward “Fanny” Alger Custer
BIRTH 30 Sep 1816
Rehoboth, Bristol County, Massachusetts, USA
DEATH 29 Nov 1889 (aged 73)
Indianapolis, Marion County, Indiana, USA
BURIAL
South Lawn Cemetery
Dublin, Wayne County, Indiana, USA
MEMORIAL ID 209627648