We must take note that this was not Adam's first son. Adam had Cain and Abel before Seth, but the lineage that would be followed throughout the Bible would be through Seth.  It is highly likely that Able had children. Why God chose not to follow that lineage is not known. Nor are any of Able’s descendant, if there are any, listed.

Genesis 5:4 "And the days of Adam after he had begotten Seth were eight hundred years: and he begat sons and daughters:"

You see, in none of these Scriptures did Moses go into detail about how many sons and daughters. My own opinion of the longevity of life for this early humanity was so they could populate the earth. I can’t prove it…but you can’t disprove it either! Amen!

Genesis 5:5 "And all the days that Adam lived were nine hundred and thirty years: and he died."

“Nine hundred and thirty years”: These are literal years marking unusual length of life which are accounted for by the pre-Flood environment provided by the earth being under a canopy of water, filtering out the ultraviolet rays of the sun and producing a much more moderate and healthful condition – which we covered before. 

Genesis 5:6 "And Seth lived a hundred and five years, and begat Enos:"

And Seth lived a hundred and five years, and begat Enos. Not that this was his firstborn, no doubt but he had other children before this time; but this is only mentioned, because it carried the lineage and descent directly from Adam to Noah, the father of the new world, and from whom the Messiah was to spring; and whose genealogy is to give us a principal view of this book, or account of generations from Adam to Noah.

Genesis 5:7-8 "And Seth lived after he begat Enos eight hundred and seven years, and begat sons and daughters:" "And all the days of Seth were nine hundred and twelve years: and he died."

And all the days of Seth were nine hundred and twelve years, and he died”, as did his father Adam before him. 

Genesis 5:9-11"And Enos lived ninety years, and begat Cainan:" "And Enos lived after he begat Cainan eight hundred and fifteen years, and begat sons and daughters:" "And all the days of Enos were nine hundred and five years: and he died."

We have here all that the Holy Ghost thought fit to leave upon record concerning five of the patriarchs before the flood, Seth, Enos, Cainan, Mahalaleel, and Jared. 

Genesis 5:12-14 "And Cainan lived seventy years, and begat Mahalaleel:" "And Cainan lived after he begat Mahalaleel eight hundred and forty years, and begat sons and daughters:" "And all the days of Cainan were nine hundred and ten years: and he died."

Seth, Enos, Cainan, Mahalaleel, and Jared. That which is especially observable, is, that they all lived very long; not one of them died 'till he had seen almost eight hundred years. And some much longer; a great while for an immortal soul to be imprisoned in a house of clay in a corrupt world.

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