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 252 days. He is the oldest man ever who was born in Europe as well as the oldest white man ever.
After Shigechiyo Izumi's age record was debunked and removed by the Guinness World Records in c. 2010, he considered as "the oldest validated man ever". Mortensen's male human longevity record stood for close to 15 years before being surpassed in age by Jiroemon Kimura of Japan in December 2012. Due to the fact that he moved from his native Denmark to the United States in his early 20s, he was the oldest known emigrant until Italian-American woman Dina Manfredini narrowly outlived him by just 5 days in December 2012, only 2 weeks before Jiroemon Kimura would break his male longevity record.
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. He was the world's oldest validated living man between January 20, 1994 and April 25, 1998.