In the US, increases in health-care costs and a general aging-out of the population means that we're going to be facing some serious financial problems in the years ahead.
China has this problem, compounded by an ever-more-drastic demographic shift, by which the country continues to become more and more male.
This is not a new problem, but it's not improving, either. A PRC government report this week says that the boy:girl birth ratio is 118:100 on average, and up to 130:100 in some areas. By 2020, they expect to have 30 million more marriage-age men than women.
That's not going to turn out well.