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I'm sure it helps, more time to have aha moments, more time to experiment, more likely to build better technique. Especially if you are heavily exposed to it and allowed to experiment and taught/shown how to spin yourself. Getting that right from an early age with good players around you that you can copy, I can imagine that every pro player has had that.My other theory is that starting younger also allows hr brain to specialize some resources earlier for seeing and reading spin. But as you point out, there is some survivor bias to starting young. I just find it hard to believe I would struggle so much with reading spin had I started younger. But maybe it is just a story I use go make myself feel better and there is nothing special about it.
We sometimes use the phrase here "skruvblind" - spinblind. We have referred to that for some players who look solid during knock-up and then they push a heavy topspin serve and it flies out 2 meters. Of course, almost everyone has some experience of that.. just sometimes it's more or less extreme. It's the opposite of having "feeling".