Six plaintiffs challenging the mandatory retirement of judges in the year they turn 70 have asked the Pennsylvania Supreme Court to appoint a special master.

The plaintiffs, who include three judges, want the master to develop a factual record from the testimony of judges, law professors, sociologists and court administrators in their case after the high court exercised plenary jurisdiction over their lawsuit. Among other points, the plaintiffs said they want to present evidence of demographic trends that older Americans remain productive substantially longer than older Americans did in 1968 when the amendment was adopted.