【3rd Print Confirmed!】Huge Response from "43-Year-Olds" Nationwide! Explorer Yuichiro Kakuhata's Unrivaled Theory on Humanity, 'The 43-Year-Old Peak Theory' (Shincho Shinsho)

Shincho-sha Publishing Co., Ltd. has decided on a 3rd print run for explorer and writer Yuichiro Kakuhata's theory on humanity, 'The 43-Year-Old Peak Theory' (Shincho Shinsho).

Since its release, reviews have successively appeared from notable figures such as former track and field athlete Dai Tamesue ('Weekly Shincho'), non-fiction writer Hideyuki Takano ('Weekly Bunshun'), and Akutagawa Prize-winning author K-zo Matsunaga ('Yomiuri Shimbun').

Furthermore, due to a continuous stream of purchases by readers around the age of "43" at bookstores, the decision to reprint has been made.

■ What determines the peak of life: physical strength or experience?

In his 20s, the author secretly scorned seniors who claimed, "Declining physical strength can be compensated by experience." However, as he himself reached his late 40s, he realized that "those words were not an excuse for decline, but a truth," and that one "becomes capable of achieving things that were unimaginable when they only had brute force and momentum." Why is this so?

Based on his own expedition in his late 40s, a long dog sled journey that reached Ellesmere Island, opposite Greenland, he discusses the "peak of life" through the combination of physical strength and experience.

■ Why do famous adventurers die at age 43?

Naomi Uemura, Tsuneo Hasegawa, Michio Hoshino, Hyoichi Kono, Kei Taniguchi — why did these renowned adventurers all perish at age 43? What lies behind this phenomenon? The author posits it's a "realm of evil," a gap between declining physical strength and increasing experience, which rises with age. He delves into the "43-year-old pitfall" that can entrap individuals precisely because it's considered the peak of life.

■ What are the reasons to look forward to your 50s?

The author, having passed the peak of 43, imagines his 50s and says, "Now, only enjoyable images come to mind." He even feels, "This is the most enjoyable period of my life." How did he reach such a state? He speaks of the new landscapes that become visible precisely because one has passed the peak.

■ Excerpt from the main text "Foreword"

■ Table of Contents

Introduction

Chapter 1: Expansion Period Up to Forty-Three

Chapter 2: Forty-Three as the Peak

Chapter 3: Decline Period After Forty-Three

Afterword

■ Author Introduction: Yuichiro Kakuhata

Born in Hokkaido in 1976. Explorer and writer. Known for original activities such as solo expeditions in Tibet's Yarlung Tsangpo Grand Canyon and Arctic expeditions during polar nights. In recent years, he practices long-term Eskimo-style journeys, hunting and traveling by dog sled in Greenland and Ellesmere Island, the northernmost part of Earth. He received the Kaiko Takeshi Non-Fiction Award and Oya Soichi Non-Fiction Award for 'The Blank Five Miles: Challenging the World's Largest Tsangpo Canyon in Tibet,' the Nitta Jiro Literary Award for 'The Yeti Came from the Other Side,' the Kodansha Non-Fiction Award for 'The Fate of Aglukka: 129 Dead, What the Franklin Expedition Saw in the Arctic,' and the Osaragi Jiro Award for 'Polar Night Journey.' Recent works include 'The Naked Earth' Part 1 & 2, 'The Impurity of Writing,' and 'Mountain Without a Map: 49 Days Drifting in the Hidaka Mountains.'

■ Book Overview

【Title】The 43-Year-Old Peak Theory

【Author】Yuichiro Kakuhata

【Format】Shinsho (New Book) (240 pages)

【Price】1,034 yen (incl. tax)

【Release Date】November 17, 2025

【ISBN】978-4-10-611106-8