Mage; a term made to call a bunch of people who can use Magic. This term had been used so much in the Age of Chaos even a child who could utilize even an insignificant Magic had been called a Mage—a full fledged Mage.
Of course, it would be a matter of time for the child to be an actual full fledged Mage; the situation in the Age of Chaos had been so dire everyone had no choice but to either become a Mage or a Knight.
Despite so, at that time, the term Mage had a simple meaning; it wasn't as complicated as the current era of people had made it. Furthermore, at that time, Mage was one: they stood under the same banner, and no classification made amongst them.
In the past, Mage had diverse occupation. There had been a Craftmaster who made Grimoire, Artefacts, and Magic weapons. These Craftmasters were the predecessors of the current Rune Master and Alchemist.