https://www.sciencedirect.com/science/article/pii/S0160289625000649 https://www.sciencedirect.com/science/article/pii/S016028962... Fluid intelligence peaks ea

https://www.sciencedirect.com/science/article/pii/S0160289625000649 https://www.sciencedirect.com/science/article/pii/S016028962... Fluid intelligence peaks early (20s) but crystallized intelligence peaks much later (50s-60s), and it's not like you can't crystallize a desire to continue to learn, even if you're potentially less creative from a raw intelligence perspective.