Ponder, don't pander. Wonder, don't wander

It's an interesting question I came across today. Why is it that when we're kids, we want to be astronauts, ballerinas and wildlife photographers. But the moment we turn 20 years old, our dreams go out the window? We settle for more 'practical' careers, even if that means being unhappy for the rest of our lives. Maybe childrens' wisdom shouldn't be underestimated. And perhaps it's not just coincidence then that children are infinitely happier than adults...