To be fair, back then they knew orders of magnitude less stuff. The span of their knowledge was comparable to, like, a modern middle schooler. Super impressive don't get me wrong, but this was back when you could just learn basically everything humanity knew about a subject like "chemistry" if you had a reasonable amount of free time and gumption.
I could name every Pokemon back in 1998, I think a lot of people could, or at least get most of them. That's a different feat today. Don't compare yourself to past polymaths too much.