Across Japan, the number of prisoners aged 65 or older nearly quadrupled from 2003 to 2022 – and it's changed the nature of incarceration. "Now we have to change their diapers, help them bathe, eat," Shiranaga said. "At this point, it feels more like a nursing home than a prison full of convicted criminals." Part of the problem for former inmates is a lack of support once they re-enter society, said Megumi, a prison guard at Tochigi, who CNN is identifying by her first name only for privacy. "Even after they are released and return to normal life, they don't have anybody to look after them," she said. "There are also people who have been abandoned by their families after repeatedly committing crimes, they have no place to belong." [...] The elderly population is ballooning so fast that Japan will require 2.72 million care workers by 2040, according to the government – which is now scrambling to encourage more people to enter the industry, and to import foreign workers to fill the gaps.