Act on Social Welfare for the Elderly (1963)
Japan enacted its first comprehensive elderly welfare law, establishing the framework for pensions, healthcare, and the annual centenarian count. The first survey found just 153 people aged 100 or older.
The law created the statistical system still used to track Japan's oldest citizens.
The annual count became a national barometer of longevity, rising 700-fold over six decades.
The 1963 figure is the baseline against which today's milestone is measured, showing how fast Japanese lifespans extended.
