"Demography is destiny. It underlies many of the issues that shake the world, from war and economics to immigration ... Now is probably the last time in history that our world will hold more young people than elders. Most fear that an aging world population will put a serious drain on national resources, as a shrinking working population supports a growing number of retirees. But is this necessarily so? Might an older world population have an upside?" (Quoted from site)