The justice ministry estimates that around foureen % of inmates over the age 60 have symptoms of dimentia. Traditionally, japanese prisons are highly punitive and force labor is required for everyone. But these older people, who are physically weaker and often have trouble memorizing things, are unable to keep up with the work load. So a lot of prisons have started to reduce their work load or give them simpler tasks instead. And they've even started serving purade food for all the people who have trouble chewing.