Hacking Passion (2013)
kytrinyx.com
kytrinyx.com
Things are a lot trickier with brains, since there's actually a lot more internal structural variability. Current scanning technology isn't accurate enough to tell us what the teenager (brain structures stop growing by this point) is going to be naturally good at, but that's not that far away given enough investment and the technology and enough data (basically other brains to compare to)
But more importantly, talent isn't "what you're good at", talent is "what you enjoy".