For inquire thee of the former age - That is, attend to the results of observation. Ask the generations which have passed, and who in their poems and proverbs have left the records of their experience. The sentiment which Bildad proposes to confirm by this appeal is, that though the wicked should for a time flourish, yet they would be cut off, and that the righteous, though they may be for a time afflicted, yet if they seek God, they will ultimately prosper. It was common to make these appeals to the ancients. The results of observation were embodied in proverbs, parables, fables, and fragments of poems; and he was regarded as among the wisest of men who had the fruits of these observations most at command. To that Bildad appeals, and especially, as would appear, to the fragment of an ancient poem which he proceeds to repeat, and which, perhaps, is the oldest poem extant in any language.
And prepare thyself - Make an effort, or give diligent attention to it.
To the search of their fathers - Of the bygone generations, not only to the age immediately past, but to their ancestors. He would bring the results of the observation of far distant ages to confirm the sentiment which he had advanced.