Put quite succinctly: Catholic (at least for three years), male, unmarried, high school diploma or completed vocational training.
Furthermore, it is important to know that we have a basic age limit of 40 years for entry into the novitiate. It is not a matter of acquiring new skills, but of practising a whole way of life. The older one gets, the more difficult this becomes for both sides. However, for convincing reasons, our limit for the age of entry can also be a “breathing” upper limit.