Living Longer

The oldest living American is 114 years old. She’s an Omaha, Nebraska woman named Thelma Sutcliffe. Get this—when Thelma was born in 1906, the life expectancy of an American woman was 50 years. She’s lived more than twice that. Steven Johnson explains our lengthening lifespans - he's author of Extra Life: A Short History of Living Longer and co-host of a four-part PBS documentary series of the same name.