Jeanne Calment
On Biblical account, Methuselah was the oldest man who ever lived but  Jeanne Calment was the oldest to have verifiable birth records. She was  122 years old at time of death.
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Jeanne Louise Calment was born on February 21, 1875 and passed away  in August 4, 1997. She was a French woman who reached the longest  confirmed lifespan in history at 122 years 164 days (44,724 days in  total). Her lifespan has been thoroughly documented by scientific study;  more records have been produced to verify her age than for any other  case.
Turitopsis nutricula or Hydrozoan 
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This creature, unofficially, can be considered to have the longest  lifespan. The Hydrozoan species Turitopsis nutricula is capable of  cycling from a mature adult stage to an immature polyp stage and back  again, indefinitely. This means there is, theoretically, no limit to its  life span, although no single specimen has been observed for any  extended period and it is impossible to estimate the age of a specimen.
  
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