Five years ago, in 2011, the first wave of the oldest U.S. baby boomers reached the common retirement age of 65. Since then, another 10,000 each day continue to reach this stage in their lives. The U.S. Census Bureau calculates that by 2020, 55.9 million people in the U.S. will be age 65 or older, and by 2030, that number will reach 72.7 million.