וְנֹ֕חַ בֶּן־שֵׁ֥שׁ מֵא֖וֹת שָׁנָ֑ה וְהַמַּבּ֣וּל הָיָ֔ה מַ֖יִם עַל־הָאָֽרֶץ׃
And Noah was six hundred years old when the flood of waters was upon the earth.
Read Kabbalistic (mystical) interpretations of Genesis 7:6: Zohar and classical Jewish mystical sources, free online.