Passage
and when he became twelve years old, they having gone up to Jerusalem, according to the custom of the feast,
and when he became twelve years old, they having gone up to Jerusalem, according to the custom of the feast,
Luke 2:40 and the child grew and was strengthened in spirit, being filled with wisdom, and the grace of God was upon him.
Luke 2:41 And his parents were going yearly to Jerusalem, at the feast of the passover,
Luke 2:42 and when he became twelve years old, they having gone up to Jerusalem, according to the custom of the feast,
Luke 2:43 and having finished the days, in their returning the child Jesus remained behind in Jerusalem, and Joseph and his mother did not know,
Luke 2:44 and, having supposed him to be in the company, they went a day's journey, and were seeking him among the kindred and among the acquaintances,
The verse centers on "became", "twelve", "years", "having", "gone", "jerusalem", "custom", and "feast". It is saying that the verse draws attention to "became" and "twelve", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 41's "And his parents were going yearly to..." into verse 43's "and having finished the days in their...", so "became" and "twelve" belong inside that flow. In Luke context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "became" and "twelve" with trust shaped by these words, not by a vague optimism outside the passage.