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The answer lies in your biology, and to ensure your survival and be more biologically efficient, your body develops with specialty in mind so you become someone with a few very specific yet extremely dominant patterns of thought, feeling, and behaviour—a specialist.
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Do you have some source? It could also lie in the quality or the practice or luck (specially in non-game skills like the ability to have a good blog, that might just come from being in the right niche at the right time).
If you take some think like good memory as a talent that helps you to get good at playing chess because you can better remember moves, memory can be improve past age 16.
I also don't see why you can't increase your passion for a topic after age 16.