Methushelah is the oldest man on record. He lived to be within 31 years of a millenium, and died in the year of the flood.

And Methuselah lived an hundred and eighty and seven years, and beget Lamech. The Septuagint version is an hundred and sixty seven; the Samaritan only sixty seven; the same names were given to some of the posterity of Seth as were to those of Cain, as Lamech here, and Enoch before.

And Methuselah lived an hundred eighty and seven years, and begat Lamech.

5:25 Methuselah signifies, He dies, there is a sending forth, viz. of the deluge, which came the very year that Methuselah died. If his name was so intended, it was a fair warning to a careless world long before the judgment came. However, this is observable, that the longest liver that ever was, carried death in his name, that he might be minded of its coming surely, tho' it came slowly. He lived nine hundred sixty and nine years, the longest we read of that ever any man lived on earth, and yet he died: the longest liver must die at last. Neither youth nor age will discharge from that war, for that is the end of all men: none can challenge life by long prescription, nor make that a plea against the arrests of death. 'Tis commonly supposed, that Methuselah died a little before the flood; the Jewish writers say, seven days before, referring to Ge 7:10, and that he was taken away from the evil to come.

5:25-32 Methuselah signifies, 'he dies, there is a dart,' 'a sending forth,' namely, of the deluge, which came the year that Methuselah died. He lived 969 years, the longest that any man ever lived on earth; but the longest liver must die at last. Noah signifies rest; his parents gave him that name, with a prospect of his being a great blessing to his generation. Observe his father's complaint of the calamitous state of human life, by the entrance of sin, and the curse of sin. Our whole life is spent in labour, and our time filled up with continual toil. God having cursed the ground, it is as much as some can do, with the utmost care and pains, to get a hard livelihood out comfort us. It signifies not only that desire and expectation which parents generally have about their children, that they will be comforts to them and helpers, though they often prove otherwise; but it signifies also a prospect of something more. Is Christ ours? Is heaven ours? We need better comforters under our toil and sorrow, than the dearest relations and the most promising offspring; may we seek and find comforts in Christ.