Albert Barnes Commentary Job 8:7

"And though thy beginning was small, Yet thy latter end would greatly increase." — Job 8:7 (ASV)

Though your beginning was small - On the supposition that Job's children had been cut off, his family was now small. Yet Bildad says that if he were to begin life again, even with so small a family and in such depressed and trying circumstances, if he were a righteous man he might hope for returning prosperity.

Yet your latter end - From this, it is evident that Job was not then regarded as an old man. He would still have the prospect of living many years. Some have supposed, however, that the meaning here is that his former prosperity would appear small compared with that which he would enjoy in the future if he were pure and righteous. So Noyes and Rosenmuller interpret it. But it seems to me that the former interpretation is the correct one. Bildad utters a general sentiment that though when a man begins life he has a small family and little property, yet if he is an upright man, he will be prospered and his possessions will greatly increase; compare Job 42:12: “Yahweh blessed the latter end of Job more than the beginning.”