Noah was 600 years old when the floodwaters came upon the earth in the Genesis flood story.
Genesis 7:6 states that Noah was 600 years old when the flood came. This age fits the genealogy and chronology presented in the surrounding chapters, where Noah's sons are born before the flood and enter the ark with him, their wives, and Noah's wife.
Genesis later gives another age marker: Noah was 601 when the earth had dried and he left the ark. That detail helps show that the narrative's flood chronology extends across more than a single season. The account also gives exact dates for the beginning of the flood, the ark's resting, and the final drying of the ground.
Noah's age is sometimes confused with the 950 years assigned to him at his death in Genesis 9:29. The two numbers refer to different moments: 600 at the flood's beginning and 950 at the end of his life.