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Japan is in the grip of an elderly crime wave - the proportion of crimes committed by people over the age of 65 has been steadily increasing for 20 years. The BBC's Ed Butler asks why.

At a halfway house in Hiroshima - for criminals who are being released from jail back into the community - 69-year-old Toshio Takata tells me he broke the law because he was poor. He wanted somewhere to live free of charge, even if it was behind bars.

"I reached pension age and then I ran out of money. So it occurred to me - perhaps I could live for free if I lived in jail," he says.

"So I took a bicycle and rode it to the police station and told the guy there: 'Look, I took this.'"

The plan worked. This was Toshio's first offence, committed when he was 62, but Japanese courts treat petty theft seriously, so it was enough to get him a one-year sentence.

Small, slender, and with a tendency to giggle, Toshio looks nothing like a habitual criminal, much less someone who'd threaten women with knives. But after he was released from his first sentence, that's exactly what he did.

"I went to a park and just threatened them. I wasn't intending to do any harm. I just showed the knife to them hoping one of them would call the police. One did."