Hello how may I help you? I want to know some facts about the world's tallest man anything in particular? Who was he and how tall was he? Robert Wadlow was the tallest man recordedin history. Okay and who was the oldest person of all time? He was 8 ft 11.1 inches Jeanne Calmen And how old was Jeanne Calmen? she lived 122 years and 164 days Wow. Thanks for the info. You're welcome!