Genesis 5:3 -5 When Adam was 130 years old, he had a son who was just like him, his very spirit and image, and named him Seth. After the birth of Seth, Adam lived another 800 years, having more sons and daughters. Adam lived a total of 930 years. And he died.
The above text is from The Message Bible. I've turned it over and over in my mind because I believe it holds a clue to solving the problem. I'm confident the Bible has the answer. There are so many questions.
For instance, when Seth is born and Eve says that he is to take the place of Abel, what exactly did she mean? The text says that Seth was born when Adam was 130 years of age. Are we to conclude that, prior to Cain's banishment, Abel's death, and Seth's birth, no other sons were born to Adam?
What was special about Seth? The only thing I've been able to find is that the Messiah came through his line. Could there have been unnamed, but somehow un-qualified sons, born to Adam prior to Abel and Seth? What is the age difference between Cain and Abel?
These are all questions that I'm researching. Just when I think I know something, I find out I don't know jack.
Sylvia