In the year 2000, roughly 13% of the American population was 65 or older. Its projected that by 2030, 28% of Americans will be 65 and older.
The most dramatic shift, however, is among people 85 and older. This age range is predicted to more than triple by the year 2040 likely outnumbering our school-aged children.
Those statistics are staggering. Obviously our life expectancy has lengthened greatly over the past century much due to societal and medical advances. There are, however, other key factors as to why some are more prone to live to grand old ages.