How old was Noah when he entered the ark in the Genesis flood story?

Noah was 600 years old when he entered the ark in the Genesis flood story.

Genesis 7:6 gives Noah’s age as six hundred years when the floodwaters came upon the earth. This is a specific age in the biblical chronology and refers to Noah at the beginning of the flood, not to his age when he first received the command to build the ark.

The same narrative later says Noah lived to be 950 years old. That number is often mixed up with his flood age. Genesis presents Noah as the father of three sons—Shem, Ham, and Japheth—and as the person chosen to preserve his household and representatives of the animal world. The ages in Genesis belong to its distinctive genealogical framework and are not modern historical demographic records.