Bresheit 5:27 records the death of Methuselah as 969 years. His is the longest lifespan recorded in the Torah. Is there any meaning for his death at such an age, or is there significance to the gematria of this number to explain why he died at this age?
Rashi Explains in Bereishis 7,4 that Mesushelach was a Righteous person and Hashem waited for him to die naturally so that Noach could mourn his grandfather properly for 7 days, just before the flood started. So Mesushelach's death was very significant as it coincided with the beginning of the flood and he was not puished with the wicked of that generation.
"כי לימים עוד שבעה" - (סנהדרין קח) אלו ז' ימי אבלו של מתושלח הצדיק שחס הקב"ה על כבודו ועכב את הפורענות צא וחשוב שנותיו של מתושלח ותמצא שהם כלים בשנת ת"ר שנה לחיי נח