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I guess I'm more interested in whether my ability to learn machine learning (or whatever the equivalent is in 10 years) will decrease over whether I'll be able to remember a 7 digit number.

Call that what you will.

I am confused about what you consider "ability to perform". Education is a context for performance.

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The theory is that your ability to memorize a 7 digit number (working memory) IS fluid intelligence.

The problem is that memorizing an x digit number is proven to be trainable, without much carry over to g or even other working memory tasks. I.e. - it's hard to train fluid intelligence rather than train the specific task which it is applied to.

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