What are the minimum and maximum ages one should be allowed to enter?
This will no doubt change over time as the organisation grows and lifespan increases. The upper limit on age will be only guesswork. Certainly the panels created to deliberate entrance should take into account someones age till retirement or equally their youth. Initially, 18+ seems a reasonable standard and up to 60-65 as a maximum age.
However, it depends on how the community grows if eventually it offers an education system from infancy to university, the “starting age” drops dramatically if it starts an orphanage education system in developing countries it could drop to the new born.