Matthew Henry on 1 Chronicles 23:1-23
Here we have, I. The crown entailed, according to the divine appointment, Ch1 23:1. David made Solomon king, not to reign with him, or reign under him, but only to reign after him. This he did, 1. When he was old and full of days. He was but seventy years old when he died, and yet he was full of days, satur dierum - satisfied with living in this world. When he found himself going off, he made provision for the welfare of the kingdom after his decease, and pleased himself with the hopeful prospect of a happy settlement both in church and state. 2. He did it in parliament, in a solemn assembly of all the princes of Israel, which made Adonijah's attempt to break in upon Solomon's title and set…
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David was old and full of days - On the phrase full of days, see the note on Gen 25:8.
John Gill on 1 Chronicles 23:1
So when David was old and full of days,.... Perhaps was now in the last year of his age, about seventy years old, though before he was bedridden; see 1 Chronicles 28:2,
he made Solomon his son king over Israel; declared him to be his successor; this was before the affair of Adonijah, for then he ordered him to be anointed king, and placed on the throne; and this aggravated the rebellion of Adonijah, that it was against the declared and known will of his father.
Keil & Delitzsch on 1 Chronicles 23:1
So when David was old and full of days,.... Perhaps was now in the last year of his age, about seventy years old, though before he was bedridden; see Ch1 28:2,
he made Solomon his son king over Israel; declared him to be his successor; this was before the affair of Adonijah, for then he ordered him to be anointed king, and placed on the throne; and this aggravated the rebellion of Adonijah, that it was against the declared and known will of his father.
Tyndale Open Study Notes on 1 Chronicles 23:1-2