Bob Weighton, aged 111, is set to become the world's oldest man following the death of Chitetsu Watanabe, the previous holder of the title from Japan, who was 112 years old. / VCG
A spokesperson from Guinness World Records told the BBC that it was currently investigating the title for the oldest living man following the death of Watanabe, who died just days after being awarded a certificate. / VCG