Former New York Times technology reporter John Markoff used to think robots taking jobs was cause for alarm. Then, he found out that the working-age population in China, Japan, Korea and the U.S. was declining. From a report on Recode: "We need the robots for two reasons: On the one side, there are not enough workers," Markoff said on the latest episode of Recode Decode. "The demographic trends are more important than the technological trends, and they happen more quickly. On the other side, there's this thing called the dependency ratio, the ratio between caregivers and people who need care," he added. "For the first time last year, there were more people in the world who are over 65 than under five. First time ever in history. By the middle of the century, the number of people over 80 will double. By the end of the century, it'll be up sevenfold, globally."