Why do some judicial systems require judges to retire at a fixed age?

In many judicial systems, mandatory retirement at a fixed age is implemented as a mechanism to ensure that judges remain physically and mentally fit to discharge their duties.1

While some jurisdictions provide for life tenure, others utilize fixed retirement ages to manage the composition of the bench and address concerns regarding the capacity of aging jurists to effectively perform their responsibilities. This practice is distinct from other methods of judicial discipline, such as impeachment or removal for misconduct, which are typically reserved for cases of abuse of office or illegal acts. By establishing a clear retirement threshold, systems aim to maintain the integrity and functionality of the judiciary without relying on the often cumbersome and slow processes of formal removal.1