Prior to promotion to lieutenant, a commissioned officer candidate in the Royal Navy had to pass a formal examination. Officially, a prospective lieutenant was at least 19, and was expected to produce proof of his service, which would include certificates from his commanders and journals kept while a midshipman. However, most midshipmen aspired to take the lieutenant examination at age 17 or 18, and the typical age of a midshipman was between 15 and 22. The candidate was summoned before a board of three captains and questioned about seamanship, navigation, and discipline. The board would ask questions such as: