z-scores count standard deviations. So if your fluid intelligence is one standard deviation better than the typical person your age, then when you’re in your 50s you’ll be about as good as a typical person in their 20s.
z-scores count standard deviations. So if your fluid intelligence is one standard deviation better than the typical person your age, then when you’re in your 50s you’ll be about as good as a typical person in their 20s.