This article lists 100 oldest known living or deceased heads of state or heads of government of sovereign states (often a president or prime minister), born no earlier than 1800, and whose ages are documented in reliable sources. Those currently living are in bold on gold. The longest-lived state leader with known exact date of birth and death was Chau Sen Cocsal Chhum, who lived to . Ek Yi Oun, fellow Cambodian prime minister, lived between 102 years, 1 day, and 103 years, 364 days.