Membership in the Council on Foreign Relations comes in two types: Individual and Corporate. Individual memberships are further subdivided into two types: Life Membership and Term Membership, the latter of which is for a single period of five years and is available to those between the ages of 30 and 36 at the time of their application. Only U.S. citizens (native born or naturalized) and permanent residents who have applied for U.S. citizenship are eligible. A candidate for life membership must be nominated in writing by one Council member and seconded by a minimum of three others (strongly encouraged to be other CFR members).