Quote taken from Pam Sorooshian’s article named above.
“5. It doesn’t matter when something is learned. It is perfectly all right for a person to learn all about dinosaurs when they are 40 years old, they don’t have to learn it when they are nine. It is perfectly all right to learn to do long division at 16 years old, they do not have to learn that at nine, either. It does not get more difficult to learn most things later; it gets easier.”