John Wesley on Genesis 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.