The elders are persons chosen from among the congregation and ordained for this service. Beyond that, practices vary: sometimes elders are elected by the congregation, sometimes appointed by the session, in some denominations elders serve for life, others have fixed terms, and some churches appoint elders on a rotation from among willing members in good standing in the church. However, in many churches, ruling elders retain their ordination for life, even though they serve fixed terms. Even after the end of their terms, they may be active in presbyteries or other bodies, and may serve communion.