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Nice one. also if you see extremely fit adults, it is mostly because they were extremely active/fit during their teens. (note: inverse won't be true, active teens might get unfit later). Their current diet or current activity has nothing to do with it.

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Is that causation or just correlation? Isn't it likely to be at least partially genetic - if you have "fitter" genes you are going to be fitter both as a teenager and as an adult?

It has a lasting effect on metabolism - i.e. in terms of 'calories in, calories out' as someone else put it, raising the rate at which calories 'go out' at rest.

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