Let us put the pensioners in jail and the criminals in a nursing home. This way the pensioners would have access to showers, hobbies and walks.
They'd receive unlimited free prescriptions, dental and medical treatment, wheel chairs et and they'd receive money instead of paying it out. They would have constant video monitoring, so they could be helped instantly, if they fell, or needed assistance.
Bedding would be washed twice a week, and all clothing would be ironed and returned to them. A guard would check on them every 20 minutes and bring their meals and snacks to their cell. They would have family visits in a suite built for that purpose.
They would have access to a library, weight room, spiritual counselling, pool and education. Simple clothing, shoes, slippers, pyjamas and legal aid would be free, on request. Private, secure rooms for all, with an exercise outdoor yard, with gardens.
Each senior could have a PC a TV radio and daily 'phone calls. There would be a board of directors to hear complaints, and the guards would have a code of conduct that would be strictly adhered to.
..... And the criminals?
The criminals would get cold food, be left all alone and unsupervised. Lights off at 8pm, and showers once a week. Live in a tiny room and pay £600.00 per week and have no hope of ever getting out.