Climbing Mount Fuji, Japan's tallest mountain, is no small feat, even for experienced hikers. The ascent involves a grueling 12,388-foot (3,776 m) climb, challenging terrain, and rapidly changing weather. The descent can be just as demanding, with loose rocks and gravel making every step wobbly. But none of that could stop Kokichi Akuzawa. On August 5, 2025, the 102-year-old Japanese man became the oldest person ever to reach the summit, setting a new Guinness World Record.