If the book of Genesis is correct, and if I've done my calculations correctly, Madeleine L'Engle misrepresented the pre-Flood state of the world in her book Many Waters.
It wasn't Noah's father Lamech who lived until just before the Flood, but his grandfather Methuselah. Genesis doesn't say clearly whether Methuselah died before the Flood, or in it, but I believe L'Engle was probably correct in describing Noah as having the support of a Godly elder during the century he spent building the Ark, in a world where all other families were wicked.
Furthermore, according to Genesis Adam lived well into Methuselah's lifetime.
At some earlier point, I looked into the post-Flood genealogies and found that Abraham was a contemporary of some from the first generations after Noah and his family got off the Ark.
I also noticed in Mark that the centurion who saw Jesus die, and who declared that he was the Son of God, shortly after that reported back to Pilate in person that Jesus was dead.
This song is haunting, although not directly applicable to my personal experience.
There's an interesting semi-parallel in Revelation 7:17 and 8:1:
"...and God shall wipe all tears from their eyes. And when he had opened the seventh seal, there was silence in heaven about the space of half an hour."
Some years back there were some public comments from famous authors about the Susan in the Narnia books not being present for the Final Battle and what followed. It was framed as bigotry against women and people of average morals.
Neil Gaiman's came in the form of a short story, "The Problem of Susan," which from an excerpt I found is apparently quite vile.
Gaiman has fallen out of public favor as allegations against him have begun to surface.
Two other authors were J. K. Rowling, who ought to know better, and Phillip Pullman, who also writes vile stories, I've been told.
Pastor Douglas Wilson has a lucid, sensitive, and rather long rebuttal to the Problem of Susan; link below.
My own, lesser contribution here, is that C. S. Lewis was a fan of George MacDonald, and MacDonald wrote some vivid portrayals of spiritual devolution. In The Princess and Curdie, Curdie was given the ability to discern which beast a person's moral character was descending into by holding their hand. In ...