According to Genesis, how old was Noah when the Flood covered the earth?

According to Genesis, Noah was 600 years old when the Flood came upon the earth.

Genesis 7:6 gives Noah’s age as 600 at the start of the Flood. This is distinct from the later statement that Noah lived to be 950 years old. The number marks Noah’s age at the event, while the larger number describes his total lifespan in the biblical genealogy.

The account also gives ages for Noah’s sons at different points, which can make timelines confusing. Genesis says Noah fathered Shem, Ham, and Japheth, but it does not present all three as necessarily born in the same year. The age of 600 belongs specifically to Noah and the beginning of the Flood, not to the construction of the Ark or the birth of his sons.