>>3665177Because they are very distinctive determinant of both great genetic makeup and general health over, at least, few years. And the best thing it's universal among all cultures, for thousands of years in human history.
Person needs to acquire decent amount of nourishment of decent quality regularly (basic needs are taken care of indicator), take care of it using hair products and time (wealthy upbringing indicator), be free of parasites and overall in good health. Last one doesn't really stands up much in XXI century but one can do serious damage with wrong diet (so common in first-world countries), and having wrong diet dor so long it causes hair damage means this person might have bad upbringing. Also worth noting that genetic factor can also tip scale of previous elements by quite a margin, but it works both ways.
But nowadays, as anon here
>>3669773 said: taking care of and sticking to routine. Discipline is thing learnt during childhood and adolescence so we can, again, loop back to social aspects of wellbeing. This is one hell of the topic here, but to sum up "these are the times we live in" and that's why long, beautiful hair are so rare and yet it shouldn't be the case.
