June 24 (UPI) -- The world is aging at an unprecedented rate. The number of people aged 60 and older is expected to reach 1.4 billion by 2030 and exceed 2 billion by 2050. This transformation is advancing especially quickly in Latin America and the Caribbean, where older people are projected to represent one-quarter of the region's population by the middle of this century. The demographic shift will inevitably affect health systems and public policy. Yet its most complex consequence may be