John Gill's Bible Commentary Ver. 1. So when David was old and full of days , etc.] 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.
Matthew Henry Commentary
Verses 1-23 - David, having given charge concerning the building of the temple settles the method of the temple service, and orders the officers of it. When those of the same family were employed together, it woul engage them to love and assist one another.
Original Hebrew ודויד1732 זקן2204 ושׂבע7646 ימים3117 וימלך4427 את853 שׁלמה8010 בנו1121 על5921 ישׂראל׃3478