The Wise Old Man is an NPC that only appears in the secret lot of the Bon Voyage Sub-neighborhood, Takemizu Village, which is called Pagoda in the Shadows. He is based on the idea of a shaman, as he holds a secret that can be told to selected Sims.
He will not talk to Sims until they pour some tea for him. Once they do, he will perform Tai Chi. If a Sim joins him for a few Sim hours, he will say something like "You have the grace and wisdom to hold the tale". He teaches the Sim the dragon tale story. Sims who hear the story can tell it to other Sims.
The objective here is simply to build up a relationship with the man and wait. It's advisable to know how to use the gesture "Bow" before visiting this lot. The Pagoda in the Shadows is a big pagoda. There is nothing on the lot except bamboo, the man in his pagoda, and a tea set. There are no bathrooms or real food on the lot.
When summoned to a lot by the mailbox with testingcheatsenabled, in the Make NPC section that summons random NPCs and visitors he is referred to as the Hermit although when he's summoned the tool tip still calls him Wise Old Man. Using the voodoo doll on him may help make him friendlier.
The Wise Old Man is generated once his NPC purpose is needed, unlike most other NPCs that exist before the start of the game. So technically speaking, there are no pre-made Wise Old Men, only game-generated ones. This is also the case of Edward Dregg, and Unsavory Charlatan.