Watch: Robots are becoming companions and care takers across Japan

The world is getting older. By 2050, the global population of those age 65 and older is projected to nearly double to 1.6 billion. This global graying has given birth to a new phrase: "super-aging." A nation is said to be super-aged when more than 1 in 5 of its people are 65 and older. The United States isn't there yet, but the trend line points that way in decades to come.