Citing his age and efforts to get clean, a Manhattan appeals court imposed a one-year suspension on a lawyer whose nearly five-decade legal career has been checkered by a lengthy disciplinary record for buying heroin from a client while representing him in a drug case.   

Kenneth Linn, who was admitted into practice in December 1968, was ordered by a panel of the Appellate Division, First Department, to participate for one year in the Lawyer Assistance Program, which serves lawyers and judges who struggle with substance abuse or other mental health issues.