Wow, I didn’t realize that C.S. Lewis was riffing off of 1 Corinthians: 13 when he wrote (emphasis mine)
When I was ten, I read fairy tales in secret and would have been ashamed if I had been found doing so. Now that I am fifty, I read them openly. When I became a man I put away childish things, including the fear of childishness and the desire to be very grown up.
Have you ever heard of the great oxidation event? https://en.m.wikipedia.org/wiki/Great_Oxidation_Event
Though I doubt the anaerobic bacteria was aware enough to be able to deny what was happening in the first place.
Every time I read about how we’re finding micro plastics in places we thought they couldn’t reach (blood-brain barrier recently) I think of the GOE.