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How old was Alexander when Aristotle began teaching him?

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Marble bust of Aristotle with a beard and draped robe, showing detailed facial features and wavy hair, set against a dark background. — Aristotle Aristotle, detail of a Roman copy (2nd century bce) of a Greek alabaster portrait bust (c. 325 bce); in the Museo Nazionale Romano, Rome.

Aristotle began tutoring Alexander the Great in 343 or 342 BCE, when Alexander was 13 years old. He continued to instruct the future king until Alexander reached the age of 16.12