וַֽיְחִי־נֹ֖חַ אַחַ֣ר הַמַּבּ֑וּל שְׁלֹ֤שׁ מֵאוֹת֙ שָׁנָ֔ה וַֽחֲמִשִּׁ֖ים שָׁנָֽה׃
Setelah air bah, Nuh hidup tiga ratus lima puluh tahun lagi.
Radak
ויחי נח, the principal reason why the Torah lists the ages of these antediluvian people is only to enable us to count back to when human history started with the creation of Adam. All such basic historical data are provided both in the Torah and in the Books of the prophets.
Tze'enah Ure'enah
“Noah lived three hundred years after the Flood” [9:28]. Noah lived for three hundred and fifty years after the Flood. He was nine hundred and fifty years old when he died.