Japan has crossed a threshold no nation has reached before — more than 100,000 of its citizens have lived a century or longer, a testament to diet, medicine, and the quiet discipline of daily life. Yet this triumph of longevity arrives wrapped in an existential irony: the same society that has mastered the art of growing old has largely stopped bringing new life into the world. With a fertility rate of 1.14 and a population projected to shrink by nearly a third before 2070, Japan stands as a mirror held up to the modern world — asking what it means to live long, and whether a civilization can