So perhaps the real problem for groups like Mr Kimura's is not confusion with criminals but competition from mainstream politicians.

ECONOMIST: Japan's ultra-nationalists

Japan's Jiroemon Kimura celebrated his 114th birthday earlier this year.

BBC: 'Oldest man in Britain' celebrates 109th birthday

Guinness World Records has certified Mr Kimura as the world's oldest living person and the oldest living man.

BBC: World's oldest man in Japan celebrates 116th birthday

Japanese man Jiroemon Kimura, who holds the distinction of being the world's oldest living person, is celebrating his 116th birthday on Friday.

BBC: World's oldest man in Japan celebrates 116th birthday

Mr Kimura currently lives at home under the care of his grandson's widow and eats his meals thrice a day.

BBC: World's oldest man in Japan celebrates 116th birthday