The math is unforgiving. According to PHI*, by 2060 the U.S. population of adults age 65 and older is projected to grow from 57.8 million to 88.8 million—a 54% increase. The number of adults 85 and older will nearly triple. Meanwhile, the working-age population (18 to 64) will grow by just 4%. Today’s ratio of working-age adults to those 85-plus stands at 31 to 1. By 2060, it drops to 12 to 1….