Based on available records, Rickman became the World’s Oldest Living Woman on 10 December 1965, following the death of 110-year-old Ferdinise Nébolle (Martinique, France).
It possible that Rickman became the World’s Oldest Living Person following the death of James Monroe King (15 November 1854 – 5 June 1967), though King’s age remains unverified.
In September 1968, Rickman celebrated her 113th birthday, becoming the fourth person validated to have reached this age, after Delina Filkins in 1928, Betsy Baker in 1955, and Mary Kelly in 1964.
Following her passing, Tome Horigome (Japan) succeeded her as the World’s Oldest Person.
Rickman’s age was validated by LongeviQuest on 22 May 2023, based on the research of Jimmy Lindberg, Ilias Leivaditis, and Anson Davis.