Hello how may I help you? hello, who is the oldest person of all time? The oldest person who ever lived was Jean Calment. how old does jean calment? When she died she was 122 years, 164 days old. do you know which country she lived? Jean Calment was a French citizen and lived in France all her life. thank you for your help. You are very welcome. Do you have any other questions today? that's all thank you. Have a nice day and thank you!