Nanmoku (南牧村 Nanmoku-mura?) is a village located in Kanra District of southwestern Gunma Prefecture in the northern Kantō region of Japan. As of February 2015, the town had an estimated population of 2,025 and a population density of 17 persons per km2. Its total area was 118.83 km2. Nanmoku, like many rural areas in Japan, is seeing a significant amount of population decline; in 1955 there were more than 10,000 inhabitants. The majority of the remaining villagers are over 60 years in age (57.1% in 2012), with a median age of 62.5 for the total population – the oldest in Japan.