In a nation where longevity has long been woven into the cultural fabric, Japan has crossed a threshold that reframes what it means to grow old: for the first time, more than 100,000 of its citizens have reached or surpassed their hundredth year. This milestone — 107,677 centenarians counted as of September 2026, the vast majority of them women — is not merely a statistical achievement but a reflection of decades of investment in diet, medicine, and collective care. It raises, with quiet urgency, the question every aging society must eventually answer: how do we ensure that a long life is also