How EARLY?!

Thanks for the responses to the “experienced” question! Sorry to be so repetitive, (manipulative, you might even think {I know…these are kind of loaded questions…please try not to get totally fed up with 'em})… but In the same vein…How “EARLY” (ideally) do you think that someone “ought” to learn how to shape? (if they show a serious interest!). (I’m going somewhere with this, so please bear with me). Feedback, AS ALWAYS, much appreciated!..T.