Job 15:10

“With us are both the grayheaded, etc.] The grayheaded man, or one that is so, it is in the singular number; gray hairs are a sign of old age, and an emblem of wisdom, (see <181212>Job 12:12); to which words Eliphaz may be thought to refer; Job there suggesting as if wisdom was with him, being an ancient man: and very aged men; or “man” rather; Mr. Broughton renders it, and “all gray”, as if the other word only signifies one that has a mixture of gray hairs on him, but this one all whose hairs are turned gray: much elder than thy father; or “greater”, as the same learned man renders it; and so Aben Ezra and Bar Tzemach say in the Arabic language the word signifies, and may design a third…”

“On our side, thinking with us are the aged. Job had admitted that wisdom is with them (Job 12:12). Eliphaz seems to have been himself older than Job; perhaps the other two were also (Job 32:6). Job, in Job 30:1, does not refer to his three friends; it therefore forms no objection. The Arabs are proud of fulness of years.”

“With us are both the gray headed - That is, some of us who are here are much older than thy father; or we express the sentiments of such aged men. Job had admitted Job 12:12, that with the aged was wisdom, and in length of days understanding; and Eliphaz here urges that on that principle he and his friends had a claim to be heard. It would seem from this, that Job was very far from being regarded as an old man, and would probably be esteemed as in middle life. The Targum (Chaldee) refers this to Eliphaz himself and his two friends. “Truly Eliphaz, who is hoary-headed (דסיב) and Bildad, the long-lived (דקשיש) are with us, and Zophar, who is older than thy father.” But it is not certain that…”

“the grayheaded: Job 8:8-10, Job 12:20, Job 32:6, Job 32:7; Deu 32:7; Pro 16:31 Job 15:11”