There is no way Japan will be able to continue to fund the present level of old-age benefits. From Simon Black at sovereignman.com:
Earlier this week the United Nation’s Department of Economic and Social Affairs released its 2019 world population report… and there were a number of very interesting findings:
1) World population continues to grow slightly, but the rate of global population growth is at the lowest level since at least 1950.
2) Global population growth rates are unevenly distributed. Developed nations (including the US, Japan, Western Europe) suffer from alarming declines in fertility rates, while developing countries are experiencing rapid population growth.
The 47 least developed countries in the world (mostly in Africa) are the fastest growing, and just NINE countries are expected to make up HALF of global population growth over the next three decades.