Genesis 5:32 NIV
32 After Noah was 500 years old, he became the father of Shem, Ham and Japheth.
All Noah's ancestors had children when they were around one hundred years but when it came to him it is said he had children when he was five hundred years old.
6 When Seth had lived 105 years, he became the father[b] of Enosh.
9 When Enosh had lived 90 years, he became the father of Kenan.
12 When Kenan had lived 70 years, he became the father of Mahalalel
1 When Enoch had lived 65 years, he became the father of Methuselah.
But when it it came to Noah he is said to have had children when he was five hundred years old
Could there be something significant about why it took him this long to have children?