a) To ensure freedom from control by elected officials
Explanation:
Constitutionally (Article III), federal judges are appointed for life. The Constitution gives federal judges employment security so they may resolve cases without public or political pressure. Even if they make unfavorable judgments, federal judges can only be impeached.
They are sheltered from the political process yet being young and inexperienced encourages judges to remain on the bench long after good reason would have retired them. According to Eastman and UT professor Stephen Vladeck, term restrictions might diminish independence and let money influence the system. If judges were obliged to retire at 60, some industry or interest may have employed them later.
