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You are absolutely right! 20 year olds make many wrong decisions because they are unable to control their hormonal power! And they also have to face many losses! Your statement was policy-oriented! And in my opinion, both parents and role models of teenagers should continue to educate teenagers on this issue! So that teenagers do not make wrong decisions! And do not do anything bad while investing.
I am not proclaiming that we can prevent teenagers and young people from making mistakes, since as has already been posted, sometimes they are going to be stubborn as fuck, and so it can be a bit difficult sometimes to provide them with sufficient tools so that they might be able to help themselves, but they still might end up screwing up a lot and even doing opposite of what their older self might later come to realize to be mistakes and/or wrong directions.
Some young folks will get caught into a life that involves a series of bad decisions, and sometimes they will end up learning later and other times they will stay stubborn for so long that they end up contributing to their own bad outcomes. I am not claiming to know the solutions, even though surely some young folks progress through their bad (or full of mistake) behaviors in better directions than others, and surely sometimes the reason might be in relation to role models and some various strokes of luck or even getting them interested in certain kinds of activities or exposures to environments that help them to avoid going too far in bad directions and making too many mistakes.
Perhaps I do agree with you to a great extent yet young people within the mention age could sometimes make right decisions even without their parents providing the foundations. young people within their 20s are prone to mistakes that we do realise later on but this mistakes regarding investment are always personal decisions in my honest opinion.
Although there are activities that keeps young people engaged and caught out of the right part yet we keep letting ourselves into it.
Using myself as an example; I'm in my earliest 20s but I've got a little bit of knowledge and made decisions that's way against the expectations of people within this age perhaps I know it's a self taught and a discipline that brought me to this stage hence when I see young people within my age making the popular mistakes I do agree that young people are self voluntary to mistakes.