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> they also seem significantly smarter than older generations.

They seem or they are? In many places, statistically, they're actually NOT smarter. It's the other way around.

must be availability bias on my end.

still though - newer generations must get smarter because the cumulative knowledge of society increases with time.

to your articles, i don't know if test scores on reading and math are necessarily good measures of intellect

Knowledge and intelligence are not the same, although there might be some link.