12:1-7 We should remember our sins against our Creator, repent, and seek forgiveness. We should remember our duties, and set about them, looking to him for grace and strength. This should be done early, while the body is strong, and the spirits active. When a man has the pain of reviewing a misspent life, his not having given up sin and worldly vanities till he is forced to say, I have no pleasure in them, renders his sincerity very questionable. Then follows a figurative description of old age and its infirmities, which has some difficulties; but the meaning is plain, to show how uncomfortable, generally, the days of old age are. As the four verses, 2-5, are a figurative description of the infirmities that usually accompany old age, ver. 6 notices the circumstances which take place in the hour of death. If sin had not entered into the world, these infirmities would not have been known. Surely then the aged should reflect on the evil of sin.

4. doors—the lips, which are closely shut together as doors, by old men in eating, for, if they did not do so, the food would drop out (Job 41:14; Ps 141:3; Mic 7:5).

in the streets—that is, toward the street, "the outer doors" [Maurer and Weiss].

sound of … grinding—The teeth being almost gone, and the lips "shut" in eating, the sound of mastication is scarcely heard.

the bird—the cock. In the East all mostly rise with the dawn. But the old are glad to rise from their sleepless couch, or painful slumbers still earlier, namely, when the cock crows, before dawn (Job 7:4) [Holden]. The least noise awakens them [Weiss].

daughters of music—the organs that produce and that enjoy music; the voice and ear.