Those responsible for us when we are children are usually the first people to give us advice. They're often—though not always—our parents. Growing up, we all listened to our parents tell us to "do this" or "don't do that", constantly warning us to be careful with such and such things; and when we challenged them, we'd most likely get an answer like "you'll understand when you're older," or something along those lines.
It turns out, our parents were actually right about a lot of stuff! Perhaps even more than we care to admit. Click through the gallery and see if you agree.