The age of Noah when he was called by God is recorded in the Bible, specifically in the book of Genesis. According to Genesis 5:32, Noah was 500 years old when he became the father of Shem, Ham, and Japheth. This event happened before God called Noah to build the ark.

After the birth of his sons, Genesis 6:9 says that Noah walked with God and was a righteous man among his generation. This was important because God had seen the wickedness and corruption that had overtaken humanity, and He decided to cleanse the earth of all its sinfulness through a great flood.
Genesis 6:13-14 tells us that God spoke to Noah and instructed him to build an ark to save himself, his family, and representatives of every kind of land animal from the floodwaters. Noah obeyed God and spent the next hundred years building the ark according to God’s specifications.
So, based on the information given in the Bible, we can conclude that Noah was around 600 years old when the flood finally came. Genesis 7:6 states that Noah was six hundred years old when the floodwaters came upon the earth. This means that Noah spent about 100 years building the ark before the floodwaters arrived.
Noah’s obedience to God’s instructions saved him and his family, as well as the animals that were with him on the ark. After the flood, God made a covenant with Noah, promising never to destroy the earth with a flood again. This covenant was sealed with a rainbow, which God said would be a sign of His promise to mankind.
In summary, according to the Bible, Noah was 500 years old when he became a father and around 600 years old when God called him to build the ark. Noah’s faithfulness and obedience to God saved him and his family from the flood and allowed humanity to continue to thrive on earth.