As a young believer, my Presbyterian pastor asked if a man is called of God to an office, how is he uncalled if he has never demonstrated that he is unfit? If a deacon or elder is called this year, is he suddenly uncalled exactly two years later? In recent years, I've seen officers given sabbaticals so they could come back and serve refreshed, and I've seen folk reach ages when they can no longer reasonably serve and step aside, honorably.