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In page Apprenticeship:

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There are three levels of apprenticeship. The first level is the apprentice, i.e., the "çırak" in Turkish. The second level is pre-master which is called, "kalfa" in Turkish. The mastery level is called as "usta" and is the highest level of achievement. An 'usta' is eligible to take in and accept new 'ciraks' to train and bring them up. The training process usually starts when the small boy is of age 10–11 and becomes a full-grown master at the age of 20–25. Many years of hard work and disciplining under the authority of the master is the key to the young apprentice's education and learning process.[citation needed]