Whay on earth is wrong with youth today if they want to pursue a six-pack at the age of 12..... Really, tell me why....

Execpt for esthetic reasons there is need for a six-pack, but if you really want them there are only two ingredients; Sit-ups and dieting.
Loads of sit-ups (and all its varieties) every other day and start starving, remember that bodybuilders(models) almost wont eat anything a week before to obtain those insane low fat percentages, and that is far from healthy.

Just work out and eat healthy and you will get a defined stomach, but a true sixpack like in the magazines are almost impossible to sustain