“Or the twelfth year was the commencement of our Lord's disputation with the doctors, for this was the number of the Evangelists necessary to preach the faith.”
Ambrose of Milan, 4th c. — Catena Aurea by Aquinas
Original
42And when he was twelve years old, they went up to Jerusalem after the custom of the feast.
Modern
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Teens
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Kids
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In context
40And the child grew, and waxed strong in spirit, filled with wisdom: and the grace of God was upon him.
41Now his parents went to Jerusalem every year at the feast of the passover.
— Luke 2:42 —
43And when they had fulfilled the days, as they returned, the child Jesus tarried behind in Jerusalem; and Joseph and his mother knew not of it.
44But they, supposing him to have been in the company, went a day’s journey; and they sought him among their kinsfolk and acquaintance.