Thomas Peter Thorvald Kristian Ferdinand Mortensen (August 16, 1882 – April 25, 1998), known as an adult as Christian Mortensen, was a Danish-born American supercentenarian who lived to age 115 years and 36 weeks and was believed to be the second oldest person ever born in Europe behind the possibly disputed 122-year-old Frenchwoman Jeanne Calment as well as the second-oldest man in history behind the nowadays debunked 120-year-old Japaneseman Shigechiyo Izumi. However, as both Calment and Izumi are debunked or possibly disputed, Mortensen was the fifth oldest person in history at the time of his death (behind Canadianwoman Marie-Louise Meilleur who died just nine days earlier, Americanwoman Sarah Knauss who then was the oldest living person, Japanesewoman Tane Ikai and Americanwoman Maggie Barnes who died less than 14 weeks earlier), the only man who became 115 years old (before Emiliano Mercado del Toro's 115th birthday on 21 August 2006) and the oldest man ever though until December 27, 2012 whereafter his record was broken by Japaneseman Jiroemon Kimura (who was the third man to become 115 years old as well as the only man to become 116 years old).
Mortensen was baptised in Fruering Church on December 26, 1882. Besides his baptismal record, other records include the 1890 and 1901 census enumerations in Denmark, and church confirmation in 1896.
- New York Times, "Christian Mortensen, 115, Among Oldest," 1998-05-03. Accessed 2007-02-16
- Christian Mortensen's birth record (see image) shows his birthplace as the village of Skårup, Denmark, which was in Sogn Fruering parish, Herred Hjelmslev Hundred, Skanderborg County, which is now part of Skanderborg municipality.
- Wilmoth, John; Axel Skytthe; Diana Friou; Bernard Jeune (1996). "The Oldest Man Ever? A Case Study of Exceptional Longevity" (PDF). The Gerontologist. 36 (6): 783–788. doi:10.1093/geront/36.6.783. Archived from the original (PDF) on 9 August 2011. Retrieved 9 September 2010.