John Gill Commentary Genesis 5:9

"And Enosh lived ninety years, and begat Kenan." — Genesis 5:9 (ASV)

And Enos lived ninety years, and begat Cainan .
] According to the Septuagint a hundred and ninety years; it can hardly be thought but that he had sons or daughters before, but this is only taken notice of for a reason before given.