2 Kings 14:21

21 And all the people of Judah take Azariah, and he [is] a son of sixteen years, and cause him to reign instead of his father Amaziah;

2 Kings 14:21 Meaning and Commentary

2 Kings 14:21

And all the people of Judah took Azariah
Called Uzziah in the next chapter, and so in the book of Chronicles; both names signifying much the same, the one "the help of the Lord", the other "the strength of the Lord":

(which was sixteen years old;)
yet as he began to reign in the twenty seventh year of Jeroboam, ( 2 Kings 15:1 ) and Jeroboam began to reign in the fifteenth yaer of Amaziah, ( 2 Kings 14:23 ) , he could be but four years of age, for the solution of which, (See Gill on 2 Kings 15:1):

and made him king instead of his father Amaziah;
which was after his death, and not when he fled to Lachish, as Kimchi thinks.

2 Kings 14:21 In-Context

19 And they make a conspiracy against him in Jerusalem, and he fleeth to Lachish, and they send after him to Lachish, and put him to death there,

20 and lift him up on the horses, and he is buried in Jerusalem, with his fathers, in the city of David.

21 And all the people of Judah take Azariah, and he [is] a son of sixteen years, and cause him to reign instead of his father Amaziah;

22 he hath built Elath, and bringeth it back to Judah, after the lying of the king with his fathers.

23 In the fifteenth year of Amaziah son of Joash king of Judah, reigned hath Jeroboam son of Joash king of Israel in Samaria -- forty and one years,