My father was living with Ora Miller and William Summitt for a while. When William filed for Social Security he had to prove his birth date. He couldn't because his actual birth record was lost at the court house due to fire or some other destruction.
The social security office would not believe his date so the date of 1881 was used - don't actually know how it was arrived at.
When William married Ora (nothing official) he gave his birth date as 1852. Because of the mess at Eastern Cemetery - a professor of anthropology had to establish people as to who they were. The age of 124 was supported.
Still looking for more info on William Summitt