The long lifespans in this genealogy are characteristic of the early Genesis narrative. Whatever one's view of their exact nature, they communicate the deep antiquity of the covenant line and the accumulation of years in which God preserved His plan.
Memory phrase: God guards His plan across many long years.
Talk about it: Can you imagine living five hundred years? What do you think you would learn?
Prayer: God, You are patient — guarding Your plan for hundreds of years. Help me be patient with Your timing.