By 2050, more than 1.5 billion people worldwide will be over the age of 65 -- triple the number of present-day seniors. And while the US ranks high on the aging populations' scorecard, Japan, South Korea, Spain and Italy top the list. By midcentury, a third of their populations will be over 65.
The challenges inherent in aging populations, particularly during times of economic hardship, are well documented. Perhaps the biggest issue: the inability of younger generations to support the health care and retirement needs of a ballooning older population.