Final answer:
There is no direct reference to the average age of men entering the Brother's community, but historical examples show that age of entry varied, such as eight to ten in the Ottoman devshirme system and eighteen to twenty-five in the Civilian Conservation Corps.
Step-by-step explanation:
The average age of men who entered the Brother's community cannot be precisely determined from the given references as there is no direct information on this specific community. However, we can infer general historical age-related practices from similar contexts provided. For example, the Ottoman devshirme system required Christian boys, ideally aged eight to ten, to be educated and later serve in various roles. The Civilian Conservation Corps employed young men between the ages of eighteen and twenty-five. Considering these examples, it's clear that the age at which men entered different communities or systems greatly varied depending on the socio-historical context and purpose.