After this lived Job an hundred and forty years, and saw his sons, and his sons' sons, even four generations.

Wesley's Notes

42:16 After this, and c. - Some conjecture, that he was seventy when his trouble came. If so his age was doubled, as his other possessions.

Jamieson-Fausset-Brown Bible Commentary

16. The Septuagint makes Job live a hundred seventy years after his calamity, and two hundred forty in all. This would make him seventy at the time of his calamity, which added to a hundred forty in Hebrew text makes up two hundred ten; a little more than the age (two hundred five) of Terah, father of Abraham, perhaps his contemporary. Man's length of life gradually shortened, till it reached threescore and ten in Moses' time (Ps 90:10).

sons' sons-a proof of divine favor (Ge 50:23; Ps 128:6; Pr 17:6).

Matthew Henry's Concise Commentary

42:10-17 In the beginning of this book we had Job's patience under his troubles, for an example; here, for our encouragement to follow that example, we have his happy end. His troubles began in Satan's malice, which God restrained; his restoration began in God's mercy, which Satan could not oppose. Mercy did not return when Job was disputing with his friends, but when he was praying for them. God is served and pleased with our warm devotions, not with our warm disputes. God doubled Job's possessions. We may lose much for the Lord, but we shall not lose any thing by him. Whether the Lord gives us health and temporal blessings or not, if we patiently suffer according to his will, in the end we shall be happy. Job's estate increased. The blessing of the Lord makes rich; it is he that gives us power to get wealth, and gives success in honest endeavours. The last days of a good man sometimes prove his best, his last works his best works, his last comforts his best comforts; for his path, like that of the morning light, shines more and more unto the perfect day.