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One of the reasons for not having the flood in that time is part of what we see from Avraham and his asking for S'dom to be saved if there were ten righteous people. Once the count got to ten, Avraham stopped praying. We learn from this that it required a minyan (10 people) to prevent the flood. Hashem was willing to be counted as one of the ten. Noach, his wife, their three sons, and their wives were 8. Mesushelach was the tenth person whose merit prevented the flood from starting. He reached the normal end of his life and died. Since there was noone to replace him, the flood could no longer be postponed. However, out of respect for him, Hashem waited the extra seven days until his mourning period was completed.

Rashi explains on Vayeira 18:32

perhaps ten will be found there: For fewer [than ten] he did not ask. He said, “In the Generation of the Flood, there were eight: Noah and his sons, and their wives, but they did not save their generation.” And for nine, together with counting [God] he had already asked, but did not find.

One of the reasons for not having the flood in that time is part of what we see from Avraham and his asking for S'dom to be saved if there were ten righteous people. Once the count got to ten, Avraham stopped praying. We learn from this that it required a minyan (10 people) to prevent the flood. Hashem was willing to be counted as one of the ten. Noach, his wife, their three sons, and their wives were 8. Mesushelach was the tenth person whose merit prevented the flood from starting. He reached the normal end of his life and died. Since there was noone to replace him, the flood could no longer be postponed. However, out of respect for him, Hashem waited the extra seven days until his mourning period was completed.

One of the reasons for not having the flood in that time is part of what we see from Avraham and his asking for S'dom to be saved if there were ten righteous people. Once the count got to ten, Avraham stopped praying. We learn from this that it required a minyan (10 people) to prevent the flood. Hashem was willing to be counted as one of the ten. Noach, his wife, their three sons, and their wives were 8. Mesushelach was the tenth person whose merit prevented the flood from starting. He reached the normal end of his life and died. Since there was noone to replace him, the flood could no longer be postponed. However, out of respect for him, Hashem waited the extra seven days until his mourning period was completed.

Rashi explains on Vayeira 18:32

perhaps ten will be found there: For fewer [than ten] he did not ask. He said, “In the Generation of the Flood, there were eight: Noah and his sons, and their wives, but they did not save their generation.” And for nine, together with counting [God] he had already asked, but did not find.

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One of the reasons for not having the flood in that time is part of what we see from Avraham and his asking for S'dom to be saved if there were ten righteous people. Once the count got to ten, Avraham stopped praying. We learn from this that it required a minyan (10 people) to prevent the flood. Hashem was willing to be counted as one of the ten. Noach, his wife, their three sons, and their wives were 8. Mesushelach was the tenth person whose merit prevented the flood from starting. He reached the normal end of his life and died. Since there was noone to replace him, the flood could no longer be postponed. However, out of respect for him, Hashem waited the extra seven days until his mourning period was completed.