South Korea, a country that won its international and industrial spurs by building dams and ships and cars and consumer electronics, by slinging steel and cement across the planet, is turning its eyes in a new direction. Anti-aging. And it's not funny. That is because today, as demographers have pointed out with growing alarm, South Korea has the world's fastest-aging population, which Global Brief, a publication of Canada's Glendon School of Public and International Affairs, says "is unprecedented in human history."