The wise old man (also called senex, sage or sophos) is an archetype as described by Carl Jung, as well as a classic literary figure, and may be seen as a stock character. The wise old man can be a profound philosopher distinguished for wisdom and sound judgment.
This type of character is typically represented as a kind and wise, older father-type figure who uses personal knowledge of people and the world to help tell stories and offer guidance that, in a mystical way, may impress upon his audience a sense of who they are and who they might become, thereby acting as a mentor. He may occasionally appear as an absent-minded professor, appearing absent-minded due to a predilection for contemplative pursuits.
The wise old man is often seen to be in some way “foreign”, that is, from a different culture, nation, or occasionally, even a different time, from those he advises. In extreme cases, he may be a liminal being, such as Merlin, who was only half human.
In medieval chivalric romance and modern fantasy literature, he is often presented as a wizard. He can also or instead be featured as a hermit. This character type often explained to the knights or heroes—particularly those searching for the Holy Grail—the significance of their encounters.
In storytelling, the character of the wise old man is commonly killed or in some other way removed for a time, in order to allow the hero to develop on his/her own.