Population trends around the world tell us one clear thing: people are living longer in every country of the world. This is to be celebrated, as technology and economic gains, along with significant public health advances, have facilitated longer lives around the world. However, a large gap still exists between the median ages of developed countries and those less developed. And of more concern: Some developed countries, especially Japan, are growing older at unsustainable levels. Low birth rates and aging populations mean fewer workers and more dependent seniors. The pressures from these demographic changes could help ease immigration concerns as well as open up the workplace more broadly for women. But this will be difficult terrain to travel. For a glimpse of our aging planet, take out your globe and Read This.