Genesis 5:32

“And Noah was five hundred years old: and Noah begat Shem, Ham, and Japheth.”

Being a new dad at 5oo+ years is mind-boggling but God made it possible.  When we later read about Noah getting instructions for the ark, we read nothing about the work being difficult for him, just that, “…according to all that God commanded him, so did he” (Genesis 6:22).