False!

Source: When I was in high school, I got a look at my permanent record. I had a measured IQ of 150 in the 4th grade and 138 in the 6th.

Extending the plot out to infinity, I should be well into the negative numbers now.

Suppose an environment e.g. stimuli/education was difficulty adjusted as you went up a grade so you were always on the very bleeding edge of your cognitive abilities.

You'd throw out the entire education system in order to do that, but would it mean that children would have higher IQ as adults?

tldr; if by modern standards we were cruel to children could we maintain high IQ levels?

I'm reminded of Dr Spock as a child in the 'education pits' in that new Star Trek movie ;-)

Using two data points to fit a curve is indeed not very intelligent. ;)

I'm using the assumption that intelligence is a linear relationship to the quantity of intellectual phlogiston in the skull.