i'm not saying that first-graders should know how to solve Schrödinger's equation or anything, but if you can start introducing the concept of the derivative around sixth or seventh grade and get basic differential equations by like, freshman year in high school
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@KamareDrache we had the exact opposite experience that nearly put us off of math; we "learned" that math was too boring and uninteresting and it wasn't until we got into calculus and everything started making sense and fitting together that we saw the appeal in it
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@Felthry You'd also need to solve the problem of children "learning" that maths is too hard for them.