* Japan's elderly dependency ratio at highest among OECD members. : TOKYO (Reuters) - Yasuhiro Furuse could have retired two years ago, but he wasn’t entirely happy with his pension income and had to put any such thoughts to bed. It was just as well for Furuse’s employer Orix Corp, a financial services group, which would have struggled to find a replacement, with Japan’s jobless rate at 26-year lows. This win-win arrangement, increasingly common in Japan, highlights a structural and policy challenge facing the world’s third-biggest economy.