One way that people thinking of minds
changing over the lifespan is the change
in "fluid" and "crystallized" intelligence.
Fluid intelligence is your ability to think
creatively about abstract ideas and solve new
problems. Fluid intelligence is very high in
young adulthood and gradually decreases as we
age. For this reason, most of the greatest
contributions to mathematics were made by
mathematicians who were under 35 years old!
Crystallized intelligence, on the other hand,
refers to facts, vocabulary, and general
knowledge about the world. Crystallized
intelligence tends to increase steadily across
most of the lifespan. That's why people can get
better and better at their jobs right up until
they retire. For this reason, most of the
biggest contributions to philosophy were made by
people who were much farther along in their
careers, after they had time to read a lot of
books and learn a lot of new things!
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