> > But one thing that I've read but cannot find at the > moment is that > with respect to statistical reliability over a > lifetime, the scores > stabilize more stating when the brain is mostly > finished developing, > starting roughly at or somewhat before puberty. That > is, there is more > of this long-term stability in the scores starting at > that age in > comparison to starting at much earlier ages. You may > have noticed this > yourself. >
Around age 10 is the conventional wisdom. Which is why I was particularly interested in the study (published in a peer-reviewed journal) showing changes in teen brains that are correlated with changes in IQ scores. That is above the age when we expect IQ scores to stabilize.