During the Feast of the Passover, Jesus at age 12 was found among the Jewish scholars in the temple "both hearing them, and asking them questions." (Luke 2:46.) The knowlege he displayed was extraordinary, but the circumstance of his being there among the doctors of the law was not particularly unusual. Why not?
(Answer on page 13)
Here's answer to week's question
(From page 2)
By custom, a Jewish boy at the age of 12 was taken to Jerusalem at one of the feasts and tested by the doctors of the law in the temple as to his knowledge of the duties and privileges to which he had been admitted. In passing this test, he was regarded as taking upon himself the yoke of the law. Thus Jesus, according to custom, was at the temple at age 12.
Source: Bible Dictionary, LDS edition of the King James Bible, p. 660.