בראשית, פרק ה׳, פסוק כ״ו

The recorded lifespans of the early generations before the flood provide a unique window into the family history of that era. By tracking these timelines, a clear picture of their lives emerges. After the birth of his son Lamech, Methuselah lived for an additional 782 years, during which he continued to have more sons and daughters.

A simple chronological calculation of this family tree reveals an unexpected reality: Methuselah actually outlived his own son. Because Lamech lived for a total of 777 years, Methuselah lived for five more years, or sixty months, following his son's passing [קאסוטו].