Sogen Kato

Sogen Kato (加藤 宗現, Katō Sōgen, 22 July 1899 – c. November 1978) was a Japanese man thought to have been Tokyo's oldest man until July 2010, when his mummified corpse was found in his bedroom. It was concluded he had likely died in November 1978, aged 79, and his family had never announced his death. Relatives had rebuffed attempts by ward officials to see Kato in preparations for Respect for the Aged Day later that year, citing many reasons from him being a "human vegetable" to becoming a sokushinbutsu (Buddhist mummy). An autopsy could not determine the cause of Kato's death.

The discovery of Kato's remains sparked a search for other missing centenarians lost due to poor recordkeeping by officials. A study following the discovery of Kato's remains found that police did not know if 234,354 people over the age of 100 were still alive. Poor recordkeeping was to blame for many of the cases, officials admitted. One of Kato's relatives was found guilty of fraud; his relatives claimed ¥9,500,000 (US$117,939; £72,030) of the pension meant for Kato.