As debates over Social Security and Medicare heat up, Americans might feel like doing what the old urban myth says the Inuit do: Ship the old folks out on the ice floes. It's cheap, simple and good for the polarbears. It is also, arguably, a bit coldhearted. So here's a warm and loving alternative that the U.S. government should endorse: Send the old people to Mexico, Central America and the Caribbean. By one estimate, almost 20 percent of gross domestic product will go to seniors by 2030. Baby boomers are the first generation of grasshoppers in U.S. history. Their parents...