As prayers and church collections tomorrow focus on the welfare of those in jail, it is the plight of older prisoners that is increasingly coming to the fore. Isolated, lonely and ignored by government reform plans, they make up the fastest growing group of an unenviable community At the age of 83, the former Bishop of Gloucester, Peter Ball, has been jailed for historic sex offences against young boys. He joins the long list of men in their seventies and eighties called to account for sexual abuse, including celebrities like Rolf Harris and Max Clifford. Then there are the four men awaiting sentence for their part in a raid on safety deposit boxes in London’s Hatton Garden last Easter. Three of these are in their sixties and seventies; the youngest is 58.But it is only the most no