From the Statutes
The Academy is made up of no less than twenty and no more than forty Ordinary Academicians and of Honorary Academicians. Upon reaching 80 years of age, Ordinary Academicians quit their task and, following a proposal by the Council of the Academy, can be appointed Honorary Pontifical Academicians by the Holy Father. Academicians are appointed by the Holy Father on the basis of their competencies in the social sciences and of their moral integrity (approved by the Holy Father on 26 June 2003).
Nomination to the Academy is a privilege reserved to the members.