Kommentar zu Divrej Hajamim I 22:5

is young and tender נַעַר, because even one [who is] forty-two years old is called נַעַר, for it is written: (Exod. 33:11): “... and his young (נַעַר) servant, Joshua the son of Nun, did not depart, etc.,” for Joshua reigned after Moses only twenty-eight years, and he lived one hundred and ten years. We find (in the first year that the Israelites were in the desert) that Scripture testifies about him: “and Joshua the son of Nun, his young [servant],” and at that time he was forty-two years old. Therefore, it was necessary to write, “tender,” because he [Solomon] was only twelve years old when he reigned.

magnified on high It was very tall, for Solomon raised it up to one hundred and twenty cubits, as it is written: (I Kings 6:3): “And the porch before the Temple of the House, etc.”