בראשית, פרק ה׳, פסוק י״ד

A long life eventually reaches its close, marked by a final accounting of the time lived. The summary of Kenan's lifespan reflects this natural end, detailing the full extent of his days.

The total count of his years is structured in a specific way. Rather than viewing his age as a single uniform number, [קאסוטו] explains that the total is built upon a primary foundation of nine hundred years. To this base, an additional one hundred and twenty months are added, which together make up the final ten years of his life.