Before our eyes, the world is undergoing a massive demographic transformation. In many countries, the population is getting old. Very old. Globally, the number of people age 60 and over is projected to double to more than 2 billion by 2050 and those 60 and over will outnumber children under the age of 5. In the United States, about 10,000 people turn 65 each day, and one in five Americans will be 65 or older by 2030. By 2035, Americans of retirement age will eclipse the number of people aged 18 and under for the first time in U.S. history.