The Rule of St. Benedict - Chapter 63. Community Rank

(1) The monks keep their rank in the monastery according to the date of their entry, the virtue of their lives, and the decision of the abbot.
(2) The abbot is not to disturb the flock entrusted to him nor make any unjust arrangements, as though he had the power to do whatever he wished.
(3) He must constantly reflect that he will have to give God an account of all his decisions and actions.
(4) Therefore, when the monks come for the kiss of peace and for Communion, when they lead psalms or stand in choir, they do so in the order decided by the abbot or already existing among them.
(5) Absolutely nowhere shall age automatically determine rank.
(6) Remember that Samuel and Daniel were still boys when they judged their elders (1 Sam 3; Dan 13:44-62).
(7) Therefore, apart from those mentioned above whom the abbot has for some overriding consideration promoted, or for a specific reason demoted, all the rest should keep to the order of their entry.
(8) For example, someone who came to the monastery at the second hour of the day must recognize that he is junior to someone who came at the first hour, regardless of age or distinction.
(9) Boys, however, are to be disciplined in everything by everyone.

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