Just got back. Your question Kriston, ability vs. achievement.

I think there is a very grey area in the middle. Obvious definitions on the extremes. The extreme on ability being the prodigy. But if you watched that video link on Mark Yu and what Lang Lang said about the teenage years and what the narrator talked about frontal lobe development during that time.

If the brain is developing, then it is possible that you can lose it, or it is modified to the point where you may not be GT anymore.

I think there is actual brain develop that occurs then that counters the fact that you cannot lose ability.

And if you get the training, that brain development may give you ability.

How much, I do not know. But I think ability vs achievement is a fine line in many cases until 21.

Ren